期刊
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
卷 71, 期 2, 页码 476-483出版社
WILEY
DOI: 10.2136/sssaj2006.0019
关键词
-
类别
Farmers of the Zuni Indian Reservation in New Mexico rely on materials transported from upper watersheds to maintain productivity of some of the oldest agricultural fields in North America. This study determined runoff and sediment production from hillslopes as functions of slope position, soil cover, and rainfall characteristics. Runoff was collected from plots in summit or shoulder [SU], backslope [BS], and footslope [FS] positions and in bare soil, microbiotic crust, oak, juniper, pinyon, and grass cover. In rainfall events that generated runoff, sediment C and N concentrations decreased with total sediment yield, but C/N ratios increased. Carbon/nitrogen ratios were generally lower in sediments from early season events. Backslope plots yielded the most sediment (125 g m(-2)) and the most organic C (2.2 g m(-2)), total N (116 mg m(-2)), and total P (34.2 mg m(-2)), but those from SU plots had the highest concentrations (e.g., 31 g C kg(-1) compared with 23 g C kg(-1) at BS and FS). Bare soil and microbiotic crust plots yielded the most sediments (441 g m(-2)) and grass the least (107 g m(-2)). Though variable, oak plots yielded more C (32.6 g m(-2)) and N (1.5 g m(-2)) than others, but bare soil and microbiotic crust plots yielded the most P (62.7 and 54.4 mg m(-2), respectively). Slope position, cover type, and rainfall characteristics interact to influence movement and processing of materials responsible for agriculturally, ecologically, and hydrologically important alluvium-derived soils in this semiarid agroecosystem.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据