摘要
采用热扩散式树干液流计(TDP)连续监测了优良固沙树种彰武松(Pinus densiflora Sieb.et Zucc.var.zhangwuensis)树干液流速率在一个完整生长季内的变化规律。并同步监测了气象、土壤含水率等环境因子,在比较分析不同生长季节彰武松树干液流速率特征的基础上,分析了主要环境因素对彰武松不同生长季液流速率影响的规律。结果表明:1)在生长季的典型晴天,彰武松树干液流速率具有与太阳辐射一致的日变化过程,日变化曲线呈典型单峰型。2)彰武松日间平均液流速率的季节间差异显著,7月份液流速率最大,6月份由于受严重土壤水分亏缺的影响,平均液流速率最小。3)在雨季,彰武松液流速率对太阳辐射驱动的响应与土壤含水率间呈紧密的正相关关系;在旱季,液流速率对太阳辐射驱动的响应与土壤含水率间关系不明确。液流速率随土壤含水率的变化过程存在明显的阈值效应。
In this study,the sap flow rate of Pinus densiflora var.zhangwuensis,an important windbreak and sand fixation species,was monitored continuously using a thermal dissipation probe(TDP)method during the whole growing season,combined with simultaneous observations of precipitation,soil moisture,solar radiation and other environmental factors.The seasonal variation of J_s of sand-fixing tree species,as well as the effects by environmental factors have been analyzed.The results showed that:1)The diurnal variation of J_s in P.densiflora var.zhangwuensis presented a single-peak curve in sunny day.2)There is a typical seasonal variation of J_s.The highest J_s appeared in July,and the smallest one appeared in June due to serious soil water deficit.3)The ratio of sap flow rate to solar radiation(J_s/R_s)correlated to soil moisture content positively in rainy season,while the relations in dry season is not clear.The value of J_s showing a typical threshold responded to soil moisture content with a sharply declining.
作者
迟琳琳
韩辉
党宏忠
张学利
张日升
CHI Linlin;HAN Hui;DANG Hongzhong;ZHANG Xueli;ZHANG Risheng(Liaoning Institute of Sandy Land Control and Utilization,Fuxin 123000,China;Zhanggutai Desert Ecosystem Research Station,Liaoning Province,Zhangwu 123203,China;Institute of Desertification,Chinese Academy of Forestry,Beijing 100091,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2020年第1期186-191,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金(31570704)
中央基本科研业务资金(CAFYBB2014MA013)资助.
关键词
彰武松
液流速率
环境因子
热扩散技术(TDP)
Pinus densiflora Sieb.et Zucc.var.zhangwuensis
sap flow rate
environmental factors
thermal dissipation probe method(TDP)
