晋西黄土区核桃玉米间作界面土壤水分变化规律及其对玉米产量的影响

对晋西黄土区核桃玉米间作模式界面上土壤水分的分布规律和玉米产量进行了研究。结果表明:(1)间作玉米的土壤含水量的季节变化极显著;(2)核桃玉米间作在垂直方向上,土壤含水量随土壤深度的增加而增加,但林带区和农作物区土壤含水量表现出较大差异;在水平方向上,随着距林带距离的增加,土壤水分增加并趋于稳定,变化曲线呈抛物线状;(3)移动窗口法分析表明,核桃玉米农林复合对土壤水分影响域主要受植被根系的分布的影响,且随着深度的不同而不同,土层深度是0～20 cm时为4.5 m,20～60 cm时为5 m;(4)由于土壤水分和其他因素(如光照和养分)的共同作用,导致了核桃玉米间作对玉米产量有负面影响,离林带越近,影响越明显。

Soil Moisture Distribution and the Effects to Grain Production in Walnut-maize Agroforestry System on the Loess Plateau in West Shanxi Province

The spatial variability soil moisture contents in different layers at a typical walnut-maize intercropping boundary in the loess region in West Shanxi were studied.The results showed that:(1) the seasonal variation of soil moisture was very significant in walnut-maize intercropping system;(2) soil moisture content increased with the increased of soil depth in vertical direction,but it had signifcant difference between forest and crop regions;soil moisture content increased with the increase of the distance ...