青海云杉林凋落物分解早期微生物生物量时空动态变化

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 青海云杉林凋落物分解早期微生物生物量时空动态变化 DOI: 10.5846/stxb202203220711 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（31901130）；中国地质调查局地质调查项目（DD20208065） Temporal and spatial changes of microbial biomass in litter decomposition early process in Qinghai spruce (Picea crassifolia) forests Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:凋落物分解过程中的微生物生物量动态对于深入了解森林生态系统凋落物分解机理具有重要意义。为了解高寒山地森林典型树种凋落物分解过程中的微生物生物量动态特征，采用凋落物袋野外原位分解法，研究了海拔2850 m、2950 m、3050 m、3150 m和3250 m树冠中心（CC）与树冠边缘（CE）青海云杉（Picea crassifolia）叶凋落物分解过程中凋落物和土壤中的微生物生物量碳（MBC）、微生物生物量氮（MBN）和微生物生物量磷（MBP）时空动态变化。时间尺度上，不同海拔CC与CE凋落物中的MBC、MBN和MBP在生长季节初期上升，生长季节后期下降；但土壤中的MBC、MBN和MBP却在生长季节初期下降，生长季节后期上升。然而，3050 m海拔CE和3250 m海拔土壤中的MBP含量呈"先下降-后上升-再下降"的倒"N"型变化格局。空间尺度上，凋落物中的MBC和MBN含量高于土壤中的，但MBP出现相反情况；CE处的MBC、MBN和MBP含量均显著（P<0.05）高于CC；总体而言，MBC、MBN和MBP含量以中海拔显著最高（P<0.05），其次为低海拔，高海拔显著最低（P<0.05）。这些结果为清晰地认识高寒山地森林凋落物分解过程及机理，以及进一步理解陆地生态系统结构和功能奠定了基础。 Abstract:Microorganism plays an important role in litter decomposition, and the change of microbial biomass is of ecological significance in understanding the mechanism of litter decomposition in the forest ecosystem. In order to understand the dynamic characteristics of microbial biomass during litter decomposition process in the Qinghai spruce forest, Qilian Mountains, we collected leaf litter samples at the crown center (CC) and crown edge (CE) by decomposition litterbags in different times (the early growing season and the late growing season) and altitudes (i.e., 2850 m, 2950 m, 3050 m, 3150 m and 3250 m). The temporal and spatial changes of microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) in litter and soil were analyzed. Temporally, the MBC, MBN and MBP increased in the early growing season and decreased in the late growing season. On the contrary, the MBC, MBN and MBP in soil decreased in early growing season and increased in late growing season. However, the content of MBP in soil at CE of 3050 m altitude and 3250 m altitude showed an inverted "N" shaped pattern, that is, "decrease-rise-decrease". Spatially, the contents of MBC and MBN in litter were higher than those in soil at all plots, but MBP was the opposite. The contents of MBC, MBN and MBP at the CE were significantly (P<0.05) higher than those at the CC. In general, the contents of MBC, MBN and MBP were the highest at medium altitude (P<0.05), followed by low altitude, and then the lowest at high altitude (P<0.05). The results would lay foundation to understand the process and mechanism of litter decomposition in the alpine mountain forest ecosystem, and further understand the structure and function of the ecosystem. 参考文献 相似文献 引证文献