摘要
８年长期坡耕地土壤水分研究表明：裸地２ｍ土层水分季节性变化呈倒Ｓ型；４０～１００ｃｍ内土层水分对作物供水极为重要；在降水量为５００ｍｍ左右的黄土丘陵沟壑区，降水能完全满足坡耕地作物生长发育；在降雨因素不成为限制作物生长发育主要因素时，水平沟耕作可以有效地控制地表蒸发，降低作物耗水量；人工草地耗水强度趋势为：沙打旺＞草木樨＞紫花苜蓿＞红豆草＞柠条（二年生）；３年生人工草地主要利用５０～２００ｃｍ土层水分，８年生人工草地利用１５０～４００ｃｍ土层水分，且８年生人工草地土壤水分恢复维艰。
The moisture research with 8 years long- term experiments in slop- land shows: the moisture seasonal dynamic change of 0￣200cm layer appears the S type; the 40 ￣100cm layer moisture is very important to supplying water for crops; in loess hilly and gully region with about 500mm rainfall, rainfall meets the demands of crops completely ; while rainfall is not a factor-limied for crop growth, the contour-level tillage controls soil water evaporation and decreases crop consuming water; the water- consuming tendency sequence of artificial grassland is as follows;Astrasalus adsurgens, Melilotus albus, Medicago satvia, Caragana korshimskii Onobrychis voiciaefolia; 3- year growth artificial grass mainly uses 50￣200cm layer water, 8-year growth artificial grassland mainly uses 150-400cm layer water and its recoves is extremely difficult.
出处
《水土保持研究》
CSCD
1996年第2期46-56,共11页
Research of Soil and Water Conservation
关键词
作物
人工牧草
耕作
坡地
土壤水分
耗水规律
crop artificial pasture tillage measure dynamic of soil water water-consuming law
