Culm Production Research Articles

Competition limits first-year growth and flowering of wiregrass (Aristida beyrichiana) at a sandhills restoration site.

Uncertainty in ecosystem restoration can be mitigated by information on drivers of variability in restoration outcomes, especially through experimental study. In southeastern USA pine savannas, efforts to restore the perennial bunchgrass wiregrass (Aristida beyrichiana) often achieve variable outcomes in the first year. Although ecotypic differentiation and competition with other native vegetation are known to influence wiregrass seedling establishment and growth, to our knowledge, no studies have examined interactions between these drivers. We experimentally quantified individual and interactive effects of competition, seed source, and soil type on wiregrass density, size, and flowering culm production in the field. We sowed seeds from dry and wet sites reciprocally into dry and wet soils and weeded half of the plots. We found that competition removal resulted in significantly larger plants and a greater proportion of flowering plants with more culms on average, regardless of seed source or soil type. Seeds sourced from a wet site resulted in more plants per plot than seeds from a dry site, which might have been influenced by the greater number of filled seeds from the wet site. After seedlings become established, competition contributes to variation in growth and reproduction. Although competition removal could help start wiregrass populations, the necessity of mitigation depends on fire management needs.

Growth and biomass production of five exotic bamboo species in North-western Ethiopia

Forests provide goods and services and the demand for these has increased over the years. To meet this demand, reforestation using fast-growing species is crucial. Bamboo is amongst the fastest-growing plant species. Consequently, the Ministry of Agriculture/East Africa Bamboo Project and the European Union Energy Project/INBAR introduced twenty-three bamboo species to Ethiopia. This study assessed the growth and biomass production potential of five of these exotic bamboo species (Dendrocalamus membranaceus, Dendrocalamus asper, Dendrocalamus hamiltonii, Bambusa vulgaris and Guadua amplexifolia). A randomized complete block design (RCBD) with three replications was used. Nine seedlings of each species were planted per plot using two meters spacing between and within rows. Sprouted culms per clump, culm length, culm diameter at breast height (DBH), average number of nodes and internode length per culm were measured. At age of 3½ years after planting, one clump of each species per plot in each block was uprooted and sorted into different components (rhizome, culm, branch and leaves). The fresh weight of each component was measured and sub-samples were taken to dry to constant weight. One-way ANOVA and then Tukey's test were used to find significantly different group means. The growth performance, in terms of culm production, culm height, internode length and biomass production, of the species was significantly different. D. asper and D. hamiltonii had superior growth and biomass production. We therefore recommend planting these two species in Guangua district and other similar areas where they can enhance the livelihoods of the communities.

Determinants of the Market Outlet Choice of Bamboo Culms (Yushania alpine) Producers in Banja District, Western Ethiopia

Bamboo meets a growing and various bamboo product demand and generates revenue. The study is aimed at analyzing the critical variables that affect the choice of alternative bamboo market outlets. By using two stages sampling procedures, 114 bamboo producers were randomly and proportionally selected. The determinants that affect the choice of bamboo market outlet were analyzed by multivariate probit model. Based on the model result, the probability of bamboo producers to select wholesaler, retailer, processor, and local traders’ outlet were 16.8%, 46.2%, 60.8%, and 54.3%, respectively. The probability of success and failure to select four market outlets were 2.5% and 2.2%, respectively. The result of MVP revealed that family size, total land holding size, amount of culm production, farming experience, distance to the market, and silviculture management practice affected the probability of farmers’ market outlet choice. Therefore, improving the producers’ knowledge and skills through capacity building and creating framers’ organization for collective action can help producers select the right market to sell bamboo products.

An overview of bamboo cultivation in Southern Italy

This study examines the development of bamboo cultivation in Europe and especially in Italy. An economic and environmental analysis of two case studies located in Calabria was undertaken, looking at the multiple products that can be obtained from bamboo, notably the production of shoots and carbon sequestration. The results suggest that bamboo cultivation is well-adapted to the Mediterranean climate and has considerable ecological and economic potential. • First study on the economic and environmental aspects of bamboo cultivation in Italy • Multiple uses of bamboo: production of culms, sprouts and CO 2 storage • For Italian farmers, bamboo cultivation can represent an opportunity to diversify production and consequently income.

In-situ soil moisture conservation in bamboos for the rehabilitation of degraded lands in the Himalayan foothills

Land degradation by water erosion is a major problem in Himalayan foothills. Bamboos due to fast growth, annual culm production, dense root network and high litterfall have enormous potential for checking soil erosion. The establishment of bamboos using in-situ soil water conservation measure can be an effective strategy for the rehabilitation of degraded lands. The study evaluates the efficacy of different types of rainwater harvesting trenches (rectangular, semi-circular and V-shaped) in augmenting the growth and biomass of two important bamboo species (Dendrocalamus strictus and Dendrocalamus hamiltonii) and their combined effect on soil and water conservation. In general, growth parameter in both the species was significantly higher under trenching treatments than the control, with higher values obtained in semi-circular trenches followed by V-shaped or rectangular trenches. Semi-circular trenches depicted 16% higher soil moisture as compared to control treatment (without trenches) irrespective of bamboo species. Soil moisture was 45% higher in D. hamiltonii and 25.1% higher in D. strictus as compared to fallow treatment during the summer season, while, in the winter season, soil moisture was 27.6% higher in D. hamiltonii and 14.5% higher in D. strictus as compared to fallow. In the year 2018, 40.7% of the trenches were silted up in V-shaped treatment, 52.4% in rectangular and 54.8% in semicircular trenching treatments. Silt deposition was higher under D. hamiltonii (50.1%) as compared to under D. strictus (48.6%). Runoff and soil loss were drastically reduced with the age of the plantation. No runoff and soil loss was observed after the fifth year of plantation thereby indicating the efficiency of in-situ water harvesting measures and bamboos in checking soil erosion. It is recommended that in Himalayan foothills, D. hamiltonii species in conjunction with semicircular trenches can be an effective strategy for land rehabilitation.

THE EFFECT OF BAMBOO CLUMP MAINTENANCE ON NEW CULM PRODUCTION IN PENGLIPURAN BAMBOO FOREST BALI, INDONESIA

The use of bamboo in the daily lives of Balinese people requires sustainable access to good quality of raw materials. One way of doing that is by managing bamboo grooves. The aim of this study is to know the effect of bamboo groove maintenance on the productivity of bamboo culms in a bamboo forest at Penglipuran, Bali. The study was conducted by cutting >2years old culms and putting more soil around the bamboo groove. The difference in culms growth before and after treatments was calculated using analysis of variance that was followed by Tukey’s Test. The results showed that clump maintenance on bambu aya (Gigantochloa aya Widjaja & Astuti), bambu tali (Gigantochloa apus (Schult.) Kurz) and bambu papah (Gigantochloa sp.) generated an increase in the production of new culms. The number of culms of bambu aya increased by 150.5%, bambu tali 94.7% and bambu papah 150.6%.

Growth performance and culm production of bamboo at the eastern Terai, Nepal

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Optimum Nitrogen Fertilization for Phyllostachys edulis Productivity and Photosynthetic Response

Nitrogen fertilizer is supplied for high production of Phyllostachys edulis (Carrière) J. Houz. shoots and culms. The objects of this study were to determine the optimum fertilizer amount, determine the effects of N fertilization on the promotion of photosynthesis, and provide help for remote sensing of fertilization effects. The shoot and culm production was significantly increased with 100, 250, and 400 kg N ha−1, and the two latter fertilization levels showed the best promoting effects without significant difference between them. Under N fertilization, the photosynthetic pigment content was increased, which led to a decline in the reflectance spectra. Nitrogen fertilization promoted quantum production and electron transport in photosystem II and inhibited the dissipation of absorbed light energy. The absorbed light energy can be emitted as fluorescence, which showed two main peaks in the red (685 nm) and far‐red (735 nm) regions. The width and area of the fluorescence peak at 735 nm declined, suggesting that N fertilization promoted the transduction of absorbed light energy in photosystem I. A remarkable reduction in intercellular CO2 concentrations and the light compensation point and an increase in the light saturation point demonstrated that the CO2 assimilation ability was increased with N supplementation. Among the three fertilization levels, 250 kg N ha−1 had the best effect on photosynthesis. We concluded that 250 kg N ha−1 is more suitable for practical application. The reflectance indexes and reflectance intensity ratio F685/F735 were significantly changed with N fertilization, indicating that they have potential value for estimating fertilization effects on bamboo production.

Ethnopedology and soil quality of bamboo (Bambusa sp.) based agroforestry system

It is widely recognized that farmers' hold important knowledge of folk soil classification for agricultural land for its uses, yet little has been studied for traditional agroforestry systems. This article explores the ethnopedology of bamboo (Bambusa sp.) based agroforestry system in North East India, and establishes the relationship of soil quality index (SQI) with bamboo productivity. The study revealed four basic folk soil (mati) types: kalo (black soil), lal (red soil), pathal (stony soil) and balu (sandy soil). Of these, lal mati soil was the most predominant soil type (~ 40%) in bamboo-based agroforestry system. Soil physio-chemical parameters were studied to validate the farmers' soil hierarchal classification and also to correlate with productivity of the bamboo stand. Farmers' hierarchal folk soil classification was consistent with the laboratory scientific analysis. Culm production (i.e. measure of productivity of bamboo) was the highest (27culmsclump−1) in kalo mati (black soil) and the lowest (19culmsclump−1) in balu mati (sandy soil). Linear correlation of individual soil quality parameter with bamboo productivity explained 16 to 49% of the variability. A multiple correlation of the best fitted linear soil quality parameter (soil organic carbon or SOC, water holding capacity or WHC, total nitrogen) with productivity improved explanatory power to 53%. Development of SQI from ten relevant soil quality parameters and its correlation with bamboo productivity explained the 64% of the variation and therefore, suggest SQI as the best determinant of bamboo yield. Data presented indicate that the kalo mati (black soil) is sustainable or sustainable with high input. However, the other three folk soil types (red, stony and sandy soil) are also sustainable but for other land uses. Therefore, ethnopedological studies may move beyond routine laboratory analysis and incorporate SQI for assessing the sustainability of land uses managed by the farmers'. Additional research is required to incorporate principal component analysis for improving the SQI and site potential assessment. It is also important to evaluate the minimum data set (MDS) required for SQI and productivity assessment in agroforestry systems.

Ecological consequences of shifting the timing of burning tallgrass prairie.

In the Kansas Flint Hills, grassland burning is conducted during a relatively narrow window because management recommendations for the past 40 years have been to burn only in late spring. Widespread prescribed burning within this restricted time frame frequently creates smoke management issues downwind. A potential remedy for the concentrated smoke production in late spring is to expand burning to times earlier in the year. Yet, previous research suggested that burning in winter or early spring reduces plant productivity and cattle weight gain while increasing the proportion of undesirable plant species. In order to better understand the ecological consequences of burning at different times of the year, plant production and species abundance were measured for 20 years on ungrazed watersheds burned annually in autumn, winter, or spring. We found that there were no significant differences in total grass production among the burns on either upland or lowland topographic positions, although spring burned watersheds had higher grass culm production and lower forb biomass than autumn and winter burned watersheds. Burning in autumn or winter broadened the window of grass productivity response to precipitation, which reduces susceptibility to mid-season drought. Burning in autumn or winter also increased the phenological range of species by promoting cool-season graminoids without a concomitant decrease in warm-season grasses, potentially widening the seasonal window of high-quality forage. Incorporating autumn and winter burns into the overall portfolio of tallgrass prairie management should increase the flexibility in managing grasslands, promote biodiversity, and minimize air quality issues caused by en masse late-spring burning with little negative consequences for cattle production.

Effects of High Nutrient Supply on the Growth of Seven Bamboo Species

Over the last decade, bamboo has emerged as an interesting plant for the treatment of various polluted waters using plant-based wastewater treatment systems. In these systems, nitrogen and phosphorous concentrations in wastewater can exceed plant requirements and potentially limit plant growth. The effects of two nutrient rates on the growth of seven bamboo species were assessed in a one-year experiment: Dendrocalamus strictus, Thyrsostachys siamensis, Bambusa tuldoides, Gigantochloa wrayi, Bambusa oldhamii, Bambusa multiplex and Bambusa vulgaris. Nutrient rates were applied with a 20:20:20 NPK fertilizer as 2.6 and 13.2 t.ha.yr−1NPK to three-year-old bamboo planted in 70 L containers. Morphological characters, photosynthetic responses, and NPK content in bamboo tissues were investigated. Under high-nutrient supply rate, the main trend observed was an increase of culm production but the culms’ diameters were reduced. For the seven species, the aboveground biomass yield tended to increase with high-nutrient rate. Increasing in nutrient rates also improved the photosynthetic activity which is consistent with the increase of nitrogen and phosphorus contents measured in plant tissues. All the bamboo species tested appears suitable for wastewater treatment purposes, but the species Bambusa oldhamii and Gigantochloa wrayi showed the higher biomass yield and nutrient removal.

Root System Dynamics of Miscanthus × giganteus and Panicum virgatum in Response to Rainfed and Irrigated Conditions in California

Miscanthus (Miscanthus × giganteus) and switchgrass (Panicum virgatum) are large perennial grass bioenergy crops in the USA and Europe. Despite much research into their agronomic potential, few studies have examined in situ root growth dynamics under irrigation and soil water deficits, particularly as they relate to shoot performance. We grew miscanthus and switchgrass in outdoor mesocosms under irrigated and rainfed conditions and assessed the spatial distribution and abundance of roots using minirhizotron images and whole root system sampling. Despite surviving an extended period of drought, shoot and root biomass, root length density, numbers of culms, and culm height were reduced in both species under rainfed (dry) conditions. However, rainfed switchgrass far outperformed rainfed miscanthus in all shoot and root growth metrics. The rainfed (drought) treatment reduced switchgrass and miscanthus whole plant biomass by 83 and 98 %, culm production by 67 and 90 %, and root length density by 67 and 94 % compared to irrigated plants, respectively. Root nitrogen concentration was higher for miscanthus (3-fold) and switchgrass (4-fold) in the rainfed treatment compared to irrigated plants and did not significantly differ between species. Unlike miscanthus, switchgrass grew roots continuously into regions of available soil moisture as surface soil layers grew increasingly dry, indicating a drought avoidance strategy. Our study suggests that switchgrass is more likely to tolerate drought by mining deep wet soils, while miscanthus relies on shallow rhizome production to tolerate dry soils.

Effects of Competition and Temporal Variation on the Evolutionary Potential of Two Native Bunchgrass Species

The capacity of restored plant populations to adapt to new environmental challenges depends on within‐population genetic variation. We examined how much genetic and environmentally based variation for fitness‐associated traits exists within populations of two native grasses commonly used for restoration in California. We were also interested in understanding how phenotypic expression of genetic variation for these traits varies with growth environment. Thirty maternal families ofElymus glaucus(Blue wild rye) andNassella pulchra(Purple needlegrass) were sampled from both coastal and interior populations and reciprocally transplanted into three replicated common gardens with and without interspecific competition at each site. Reproductive output of families differed both among years and with competition treatments. Phenotypic expression of genetic variation in culm production differed among populations and was very low when families were grown with interspecific competition. Without interspecific competition, the degree of genetic determination peaked in year two in both species (8.4 and 15.1% inE. glaucusandN. pulchra, respectively). Significant genetic differences in reproduction and phenotypic plasticity were found amongN. pulchrasubpopulations sampled less than 3 km apart, further highlighting the importance of thoroughly sampling available genetic variation in populations used for restoration. The variable and generally low expression of genetic variation indicates that rates of adaptation in restored populations of these native grasses may vary temporally and may be especially slow within competitive environments.

Population status and regeneration of a tropical clumping bamboo Schizostachyum dullooa under two management regimes

Schizostachyum dullooa (Gamble) Majumder ‘dolu bamboo’ is a thin walled sympodial moderate sized to large tufted bamboo, dominant in the successional fallows of northeast India. The impact of resource management on productivity and sustainability of the species was evaluated by investigating the population status and regeneration in Cachar tropical semi evergreen forest under private property resource management (PPRM) and common property resource management (CPRM) regimes. Population status revealed current-year, one-year, two-year and three-year-old culms contribute 54%, 24%, 16% and 6% of the total culms per clump, respectively, under PPRM. Three-year-old culms were absent in CPRM and population status was thus represented by current year (83%), one-year (16%) and two-year (1%) old culms. Net change, rate of change and % gain in population for different age classes showed the prevalence of management practices under CPRM was unscientific. Efficiency of new culm production per clump used as an index of regeneration was 69.7% in PPRM and 59.88% in CPRM. New culms produced under CPRM were small and thin. We conclude that CPRM is inappropriate for a long term economic and ecological sustainability of the species and alternative management protocols are needed for conservation of the species.

Bamboo dieback and tree regeneration responses in a subtropical forest of South America

Bamboos’ vegetative growth are frequently associated to negative effects on tree recruitment and survival and despite this process, the effects of bamboo dieback after flowering events are poorly understood due the rarity of these events. 2 years after the massive flowering of the woody bamboo Merostachys multiramea in a southern South America subtropical forest, we compared changes in environmental conditions; tree species regeneration and production of new culms in canopy gaps resulted from bamboo dieback and areas of continuous canopy allowed by sparse bamboo cover. We observed sharp differences in environment conditions mainly resulted from differences in canopy openness and a NPMANOVA revealed differences among the stands regeneration directions (species composition and density). Average density, number of culms per sapling and total height of M. multiramea did not differ between stands, although slight differences were detected with increasing values toward opened sites. Canopy gaps resulted from bamboo dieback showed higher species richness and diversity when compared to closed canopy without bamboo. After 2 years, the massive bamboo flowering and dieback resulted differences in several environmental conditions, leading to distinct regeneration directions with higher diversity toward opened areas.

Climate controls on grass culm production over a quarter century in a tallgrass prairie

The flowering of grasses is a process critical to plant population dynamics and genetics, herbivore performance, and human health. To better understand the climate factors governing grass flowering, we analyzed the patterns of culm production over 25 years for three perennial tallgrass prairie species at Konza Prairie in Kansas, USA. The three species (Andropogon gerardii, Sorghastrum nutans, and Schizachyrium scoparium) all utilize the C4 photosynthetic pathway and were measured annually at the same locations for the past 25 years in an annually burned watershed. Culm production of all three species increased with higher growing-season soil moisture and precipitation but differed in their responses to water availability at different times during the growing season. Relative to Andropogon, Sorghastrum responded more to precipitation early in the growing season, and Schizachyrium responded more to precipitation late in the growing season. Flowering by each species also revealed a threshold relationship with late-season soil moisture at approximately 1 m depth, which likely is a proxy for season-long water balance. Although flowering can be influenced by conditions antecedent to the current growing season, neither soil moisture nor precipitation during the previous year influenced flowering over the 25-year period. Flowering culm production averaged 9% and 7% of total graminoid aboveground net primary production (ANPP) in the uplands and lowlands, respectively. Interannual variation in ANPP correlated only with Sorghastrum flowering, suggesting a predominant role of the species in ANPP responses to climate.

Environmental stresses mediate endophyte–grass interactions in a boreal archipelago

Summary 1. Both evolutionary theory and empirical evidence from agricultural research support the view that asexual, vertically transmitted fungal endophytes are typically plant mutualists that develop high infection frequencies within host grass populations. In contrast, endophyte–grass interactions in natural ecosystems are more variable, spanning the range from mutualism to antagonism and comparatively little is known about their range of response to environmental stress. 2. We examined patterns in endophyte prevalence and endophyte–grass interactions across nutrient and grazing (from Greylag and Canada geese) gradients in 15 sites with different soil moisture levels in 13 island populations of the widespread grass Festuca rubra in a boreal archipelago in Sweden. 3. In the field, endophyte prevalence levels were generally low (range = 10–53%) compared with those reported from agricultural systems. Under mesic‐moist conditions endophyte prevalence was constantly low (mean prevalence = 15%) and was not affected by grazing pressure or nutrient availability. In contrast, under conditions of drought, endophyte prevalence increased from 10% to 53% with increasing nutrient availability and increasing grazing pressure. 4. In the field, we measured the production of flowering culms, as a proxy for host fitness, to determine how endophyte‐infected plants differed from uninfected plants. At dry sites, endophyte infection did not affect flowering culm production. In contrast, at mesic‐moist sites production of flowering culms in endophyte‐infected plants increased with the covarying effects of increasing nutrient availability and grazing pressure, indicating that the interaction switched from antagonistic to mutualistic. 5. A concurrent glasshouse experiment showed that in most situations, the host appears to incur some costs for harbouring endophytes. Uninfected grasses generally outperformed infected grasses (antagonistic interaction), while infected grasses outperformed uninfected grasses (mutualistic interaction) only in dry, nutrient‐rich conditions. Nutrient and water addition affected tiller production, leaf number and leaf length differently, suggesting that tillers responded with different strategies. This emphasizes that several response variables are needed to evaluate the interaction. 6. Synthesis. This study found complex patterns in endophyte prevalence that were not always correlated with culm production. These contrasting patterns suggest that the direction and strength of selection on infected plants is highly variable and depends upon a suite of interacting environmental variables that may fluctuate in the intensity of their impact, during the course of the host life cycle.

Climate controls on grass culm production over a quarter century in a tallgrass prairie

Climate controls on grass culm production over a quarter century in a tallgrass prairie

Native American Ethnobotany of Cane (Arundinaria spp.) in the Southeastern United States: A Review

Abstract Cane (Arundinaria spp.) was one of the most important plant resources for Native Americans living in the southeastern United States prior to Euro-American settlement. The use of cane permeated virtually every aspect of tribal life. Cane was used to make houses and village structures, military and hunting weapons, fishing gear, furniture and domestic implements, personal adornments, baskets, musical instruments, and watercraft. Medicines were prepared from cane, and parts of the plant furnished food and fuel. Canebrakes provided agricultural land, livestock forage, and habitat for wild game. Although large numbers of canes were harvested each year, there is no historic evidence that Native Americans actively managed canebrakes for the production of culms. The cultural importance of cane to Native Americans declined dramatically following Euro-American settlement of the southeast because: 1) trade goods were deemed superior and replaced articles made from cane in local economies; 2) the rapid disap...

Silicate and phosphate combinations for marandu palisadegrass growing on an oxisol

One of the greatest problems for pasture establishment and maintenance are the extremely low concentrations of available phosphorus in soils. The objective of this study was to evaluate the influences on productive and physiologic attributes during Marandu palisadegrass (Brachiaria brizantha) establishment, following changes in phosphorus availability in the soil through the applications of phosphate and silicate. To achieve this, a fractionated factorial 5² design was used, with 13 combinations for silicon and phosphorus, respectively, in mg dm-3: 150 and 10; 150 and 170; 150 and 330; 225 and 90; 225 and 250; 300 and 10; 300 and 170; 300 and 330; 375 and 90; 375 and 250; 450 and 10; 450 and 170 and 450 and 330, distributed according to randomized blocks, with four replications. The experiment was carried out in a greenhouse using samples of a Typic Haplustox (760 g kg-1 sand, 40 g kg-1 silt and 200 g kg-1 clay). Wollastonite was used as the source of silicate and the sources of phosphorus were Ca(H2PO4)2, KH2PO4 and NaH2PO4. Marandu palisadegrass was grown during the summer and two harvests were made during the growing season. Significant interaction between phosphorus and silicate rates was found for the number of tillers and expanded green leaves, total leaf area, dry mass production of leaf laminae and culms with sheaths, and dry mass production of plant tops. Maximum responses of the analyzed variables were reached in the combination of the intermediate rates of phosphorus (170 and 250 mg dm-3) with high rates of silicon (375 and 450 mg dm-3).