苏北淤泥质海岸防护林土壤水分的研究

Study on soil moisture content of protective forest in silting coastal area of Jiangsu Province

摘要

摘要:试验研究淤泥质海岸防护林土壤含水量的变化规律、季节动态和影响因子结果表明，土壤含水量有明显的季节变化规律并受林分影响，春季土壤含水量林地大于农田，且有随林龄增长而土壤含水量增加的趋势。林木根系对土壤含水量影响较大，林龄越大其影响层次越深。不同季节间土壤含水量存在显著差异，随土壤深度增加其差异减小。运用逐步回归(a=0.05)方法，建立土壤含水量(y)及其影响因子(X ₄为水稳性团粒含量,X ₉为测土壤水前15d的降水量，X ₁₀为水面蒸发量)线性方程为y=486.709+2.061X ₄+1.786X ₉-4.451X ₁₀，R=0.830。

Abstract:The paper has studied the variation，seasonal dynamics，and affecting factors of soil moisture content in silting coastal area of Jiangsu Province．The results show that soil moisture content has obvious seasonal variation．which is influenced by stand．In spring，the water content of forest land is higher than that of farmland，which is more obvious with the forest age increasing．There is a great effect of tree roots on soil moisture content，the older the age is，the deeper the effect is．Soil moisture content in different seasons has significant difference，from the top soil to the bottom ，the difference decreases．Applying stepwise regression(the fiducial degree is 0．05)，the equation of soil moisture content(y)can be expresed：y=486.709+2.061X ₄+1.786X ₉-4.451X ₁₀(R=0.830，X ₄：content of waterstable granule，X ₉：rain fall before 15d，X ₁₀：evaporalion from water surface)．

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