林业科学2011，Vol.47Issue(1)：29-35,7.
黄土丘陵区燕沟流域农林草地土壤水库充失水过程模拟
Simulation of Soil Moisture Dynamics under Farmland, Woodland and Grassland in Yangou Small Watershed of the Hill-Gully Region of the Loess Plateau
摘要
Abstract
The CoupModel is a one-dimensional soil-vegetation-atmosphere transfer model (SVAT). It was applied to simulate and study the processes of soil moisture loss and gain in potato farmland, acacia woodland, and grassland occurring in the hill-gully region of the Loess Plateau of China. The objective of the study was to develop theoretical guidance for farmland management and restoration of sloping farmland to woodland using measured and simulated soil moisture dynamics in three different vegetation regimes. Simulations followed the expected pattern in which water storage within the soil reservoir decreased with increasing soil matric suction and soil-water reservoir capacities were all characterized by power functions. The farmland, acacia woodland, and grassland soils respectively received a water input of 437, 361 and 429 mm water accounting for 94.3％, 77.9％ and 92.6％ of total precipitation (463 mm) in the experimental period from June 2006 to May 2007. Water storage within the soil profile of 600 cm layers ranged between 72.8％ - 79.3％ , 37.1％ - 41.2％ and 41.4％ - 47.5％ of the field capacity, respectively, in the farmland, acacia woodland and grassland. The total water loss from the soil reservoir over the simulation-year was 421, 393 and 468 mm,respectively. Overall, there was a net annual water gain of 15.3 mm in the farmland while there was a net annual water loss of 32 and 39 mm respectively from the acacia woodland and grassland. It was suggested that there was excess water for farmland to consume, while a water deficit occurred in the acacia woodland and grassland. Therefore, more attention should be paid on the assessment of sustainability of vegetation restoration with woodland and grassland species for improving soil water management and soil reservoir restoration.关键词
CoupModel/土壤水库/土壤水分/模拟/黄土丘陵区Key words
CoupModel/ soil reservoir/ soil water/ simulation/ hill-gully region of the Loess Plateau of China分类
农业科技引用本文复制引用
王力,卫三平,王全九..黄土丘陵区燕沟流域农林草地土壤水库充失水过程模拟[J].林业科学,2011,47(1):29-35,7.基金项目
西北农林科技大学"青年学术骨干支持计划"(2007)、中国科学院"西部之光"人才计划资助项目(2007YB02)和黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目(10501-227). （2007）
