【摘 要】
：
Conversion of cropland to forestry and grassland is an important method to reduce soil erosion and improve the biophysical environment in the Loess Plateau. The
【机 构】
：
Institute,Institute of Soil and Water Conservation,Northwest A & F University
论文部分内容阅读
Conversion of cropland to forestry and grassland is an important method to reduce soil erosion and improve the biophysical environment in the Loess Plateau. The feasibility, methods, and environmental effects of cropland conversion were studied based on 11 typical watersheds of national experimental bases instead of different geographic areas of the Loess Plateau. Between 1986 and 2000,cropland, sloping cropland and non-agricultural land decreased by 8%, 92.5% and 8% respectively,while forestry increased by 15.7%. The land use change not only decreased annual soil erosion by 74%, but also increased vegetation coverage by 100% and improved the soil condition and biodiversity. This can be achieved by building basic farmland, increasing capital and scientific input,and planting trees and grasses according to the natural biophysical restrictions.
其他文献
AIM: To investigate the ability of a genetically altered embryonic stem (ES) cell line to generate insulin-producing cells in vitro following transfer of the Nk
To investigate the microbial communities of microorganisms cultivated under different carbon sources, three sequencing batch reactors were operated. They were s
AIM: To find a novel antigen (Ag) presentation strategy to improve the immune responses induced by dendritic cell (DC)vaccine expressing hepatitis C virus (HCV)
A batch equilibrium techniques was used to examine the effect of dissolved organic matter (DOM) extracted from both non-treated sludge (NTS) and heat-expanded s
Total and root-severed soil respiration rates for five plots set up 50 m apart in a Betula ermanii Cham.-dark coniferous forest ecotone on a north-facing slope
To determine the vitamins A, C, and E and β-carotene content of Vicia species that can be used in animal feed, a high performance liquid chromatography (HPLC)
With several rice genome projects approaching completion gene prediction/finding by computer algorithms has become an urgent task. Two test sets were constructe
The soil organic carbon (SOC) pool is the largest component of terrestrial carbon pools. With the construction of a geographically referenced database taken fro
The investigations on the organic carbon (OC) of core sediments were carried out in Chongming east tidal flat (CM) during Scirpus mariqueter growing stage (from
Using a scheme of agricultural fields with progressively less intensive management (deintensification), different management practices in six agroecosystems loc