摘要
以陕西长武旱塬为例,分别对研究区农地和5个不同林龄(9、12、16、19 a和23 a)苹果园的土壤剖面氢氧稳定同位素进行测定,利用Craig-Gordon模型定量估算其土壤平均蒸发量,并基于“空间换时间”方法分析果园种植及生长对土壤蒸发的影响。结果表明:农地及9、12、16、19、23 a林龄苹果园的土壤蒸发量均随苹果树的种植及生长呈现先减少再增大的趋势,年均蒸发量分别为129、104、89、119、128、136 mm;苹果园的土壤蒸发量变化与叶面积指数呈显著负相关(R=-0.713);苹果园种植的前中期(9~12 a)土壤蒸发量随叶面积指数增加逐渐减小,而在中后期(12~23 a)深层土壤水被大量消耗造成的干旱胁迫使得果树叶面积减少,从而导致林下土壤蒸发量又逐渐增大。
The purpose of this study was to investigate the stable isotopes of hydrogen and oxygen in soil profiles of agricultural land and apple orchards of different stand ages(9,12,16,19 a and 23 a)in the Changwu Tableland of Shaanxi Province.Craig-Gordon model was used to quantitatively estimate soil evaporation,and thespace-for-time method was used to calculate soil evaporation.The influence of planting and growing of local orchard on soil evaporation was analyzed.The results showed that,the average annual soil evaporation of farmland and 9,12,16,19 a and 23 a apple orchards were 129,104,89,119,128 mm and 136 mm,respectively.The change of soil evaporation in apple orchards was significantly negatively correlated with the leaf area index(R=-0.71).The soil evaporation in the early and middle stages(9~12 years)of apple orchard planting gradually decreased with the increase of leaf area index,while the drought stress caused by the large consumption of soil water in the middle and deep stages of the middle and late stages(12~23 years)forced the leaf area of fruit trees to decrease,resulting in the gradual increase of soil evaporation under the forest.
作者
华溢
陆彦玮
李敏
韦昊延
王建龙
庞薛清秋
司炳成
HUA Yi;LU Yanwei;LI Min;WEI Haoyan;WANG Jianlong;PANGXUE Qingqiu;SI Bingcheng(Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education,College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of Education,School of Water and Environment,Chang’an University,Xi’an,Shaanxi 710054,China;School of Resoureces and Environmental Engineering,Ludong University,Yantai,Shangdong 264025,China)
出处
《干旱地区农业研究》
CSCD
北大核心
2023年第5期51-58,共8页
Agricultural Research in the Arid Areas
基金
国家重点研发计划项目(2021YFD1900700)
国家自然科学基金(42107068,41877017)。
关键词
苹果园
树龄
土壤蒸发
氢氧稳定同位素
黄土旱塬
apple orchard
tree age
soil evaporation
hydrogen and oxygen isotopes
Loess Tableland
