天山北坡天然草场牧草干旱指标研究  

RESEARCH ON DROUGHT INDEXES FOR HERBAGE OF NATURAL GRASSLANDS ON NORTH SLOPE OF TIANSHAN MONTAINS

作　　者：梁云[1] 陈洁[1] 孙长东 

机构地区：[1]乌鲁木齐市气象局,乌鲁木齐830002 [2]新疆气象科研所,乌鲁木齐830002

出　　处：《干旱区地理》1998年第4期68-73,共6页Arid Land Geography

摘　　要：通过降水、土壤水分、天然草场产草量之间建立的统计关系，来说明水分供应是影响牧草产量的重要因素，并依据降水和土壤水分与牧草产草量的关系划分出牧草生长中水分供给的正常、干旱等指标。This paper is meant to expound the moisture supply of soil is an important factor affecting herbage yie1d of natural grasslands. It was found that soil moisture in depth of 0~30cm affects obviously herbage yield. On the basis of statistic relationship among precipitation, soil moisture and herbage yield, the indexes of moisture supply for herbage growing are differentIated as follows: normal moisture supply, light drought and serious drought.The normal moisture supply is characterized by monthly precipitation of more than l1Omm and soil moisture of more than 75mm, the light drought by monthly precipitation of 50 －110mm and soil moisture of 60 ~ 75mm, and the serious drought by monthly precipitation of less than 50mm and soil moisture of 60mm. Their average yields of herbage per hm2 are 810, 461 and 48kg respectively.

关 键 词：天然草场 产草量 干旱指标 天山北坡 牧草 

分 类 号：S812.2[农业科学—草业科学] S812.5[农业科学—畜牧学]