Mixed Pine Hardwood Research Articles

Nitrification potentials in early successional black locust and in mixed hardwood forest stands in the southern Appalachians, USA

Soil nitrogen mineralisation and nitrification potentials, and soil solution chemistry were measured in black locust (Robinia pseudo-acacia L.), in pine-mixed hardwood stands on an early successional watershed (WS6), and in an older growth oak-hickory forest located on an adjacent, mixed hardwood watershed (WS14) at Coweeta Hydrologic laboratory, in the southern Appalachian mountains, U.S.A. Nitrification potentials were higher in black locust and pine-mixed hardwood early successional stands than in the oak-hickory forest of the older growth watershed. Ammonification rates were the main factor controlling nitrification in the early successional stands. There was no evidence of inhibition of nitrification in soils from the older growth oak-hickory forest site. Within the early successional watershed, black locust sites had net mineralisation and nitrification rates at least twice as high as those in the pine mixed-hardwood stands. Concentrations of exchangeable nitrate in the soil of black locust stands were higher than in pine-mixed hardwoods at 0–15 cm in March and they were also higher at 0–15, 16–30 and 31–45 cm depth in the black locust dominated sites in July. Soil solution nitrate concentrations were higher under black locust than under pine-mixed hardwoods. Areas dominated by the nitrogen fixing black locust had greater nitrogen mineralisation and nitrification rates, resulting in higher potential for leaching losses of nitrate from the soil column in the early successional watershed.

Agaricales, Family Amanitaceae, of the Big Thicket

Agaricales, Family Amanitaceae, of the Big Thicket

Some Observations on Pseudacris nigrita triseriata (Wied) in Texas

The observations hcrein presented are based on studies carried out primarily in the vicinity of Huntsville, Walker County, Texas, from November, 1946 through May, 1949. Because of existing conditions and available time, the most consistent seasoln of observations was conducted in 1949 with emphasis being placed upon the activities of that year. Huntsville is located in a transitional area between the humid, mixed pine-hardwoods of the east and the drier, oak-prairies to the west. Such an area provides abundant varied habitats and breeding sites for amphibians.

Soil Changes not Responsible for the Broomsedge‐Loblolly Pine‐Mixed Hardwood Succession

EcologyVolume 23, Issue 2 p. 240-240 review Soil Changes not Responsible for the Broomsedge-Loblolly Pine-Mixed Hardwood Succession Francis Ramaley, Francis RamaleySearch for more papers by this author Francis Ramaley, Francis RamaleySearch for more papers by this author First published: 01 April 1942 https://doi.org/10.2307/1931095AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume23, Issue2April 1942Pages 240-240 RelatedInformation