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当前位置: 首页 > 文章 > 不同降水年型灌溉模式对苜蓿草产量及土壤水分动态的影响 中国草地学报 2013,35 (5) 46-52
Position: Home > Articles > Effect of Irrigation under Different Annual Precipitation Patterns Modes on Alfalfa Yield and Dynamic Changes of Soil Moisture Chinese Journal of Grassland 2013,35 (5) 46-52

不同降水年型灌溉模式对苜蓿草产量及土壤水分动态的影响

作  者：
李新乐;侯向阳;穆怀彬
单  位：
中国农业科学院草原研究所
关键词：
紫花苜蓿;降雨年型;灌溉模式;产量;土壤水分动态
摘  要：
在大田条件下,探讨了不同降水年型下灌溉模式对紫花苜蓿产量的影响及土壤水分动态。结果表明:在京南地区,紫花苜蓿达到高产的最佳需水量为750～800mm之间。在枯水年,前3茬苜蓿产量随降雨和灌溉量的增加而增加,第4茬则降低,采用在苜蓿返青及1、2茬苜蓿刈割后灌水且每次灌水75mm(W3)的灌溉模式有利于苜蓿高产;在丰水年,第1、2茬苜蓿产量随降雨和灌溉量的增加而增加,3、4茬则降低,采用在苜蓿返青及第1、2茬苜蓿刈割后灌水且每次灌水50mm(W2)的灌溉模式有利于苜蓿高产。枯水年4～9月土壤水分变化基本呈W型,而丰水年为V型。枯水年和丰水年雨季前土壤水分均缓慢减小,枯水年雨季后土壤水分变化平缓,而丰水年雨季后土壤水分增加明显。
译  名：
Effect of Irrigation under Different Annual Precipitation Patterns Modes on Alfalfa Yield and Dynamic Changes of Soil Moisture
作  者：
LI Xin-le;HOU Xiang-yang;MU Huai-bin;Grassland Research Institute,Chinese Academy of Agricultural Sciences;
关键词：
Alfalfa;;Annual precipitation;;Irrigation mode;;Yield;;Soil moisture
摘  要：
Under field conditions,effect of irrigation under different annual precipitation patterns modes on alfalfa yield and dynamic changes of soil moisture were analyzed.The results showed that the optimal amount of water supply(the optimal amount of water requirement)for maximal yield of alfalfa was between 750mm and 800mm in the south of Beijing area.Irrigation and rainfall significantly improved the dry matter of the first,second and third cut alfalfa and decreased the dry matter of the fourth cut alfalfa in dry year,while they significantly improved the dry matter of the first and second cut alfalfa and decreased the dry matter of the third and fourth cut alfalfa in wet year.To achieve higher alfalfa yield,W3(irrigation amount 75mm per time,three times in a year)and W2(irrigation amount 50mm per time,three times in a year)irrigation modes should be recommended in dry year and wet year,respectively.Dynamic changes of soil moisture from April to September in dry year showed W type,while in wet year showed V type.Soil moisture was slowly decreased before the rainy season in both dry year and wet year.In the rainy season,however,soil moisture changed gently in dry year and increased significantly in wet year.

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