应用生态学报2025，Vol.36Issue(6)：1690-1698,9.DOI:10.13287/j.1001-9332.202506.004
六盘山华北落叶松液流速率对干旱类型的响应
Response of sap flow of Larix principis-rupprechtii in Liupan Mountain to drought types
摘要
Abstract
With Larix principis-rupprechtii forest in the Xiangshui River sub-basin of the Liupan Mountain area as test material,we monitored sap flow in L.principis-rupprechtii using the thermal diffusion probe during the growing season(from May 13th to September 30th)of 2022 and measured meteorological conditions and soil moisture to ex-plore the water utilization patterns of L.principis-rupprechtii forest under different drought types.The results showed that the piecewise linear function could accurately reflect the variation of the sap flow rate with soil relative extract-able water(REW)and vapor pressure deficit(VPD).Based on the thresholds of the piecewise function,the drought conditions in this area were classified into four types:non-drought(REW≥0.37 m3·m-3,VPD＜0.99 kPa),atmospheric drought(REW≥0.37 m3·m-3,VPD＞0.99 kPa),soil drought(REW＜0.37 m3·m-3,VPD＜0.99 kPa),and combined drought(REW＜0.37 m3·m-3,VPD＞0.99 kPa).The average sap flow rate of L.principis-rupprechtii was the highest under atmospheric drought(0.042 mL·cm-2·min-1)and the lowest under soil drought(0.022 mL·cm-2·min-1).The dominant factors influencing the sap flow rate varied across drought types.Under non-drought types,the dominant factors of sap flow were VPD and solar radiation(Rs).Under soil drought,the main influencing factor of sap flow was Rs.Under atmospheric drought and combined drought,the main influencing factors of sap flow were REW and Rs.When facing drought stress,L.principis-rupprechtii would initiate trunk sap flow earlier for trunk water replenishment,with soil moisture as the main limiting factor.关键词
华北落叶松林/液流速率/干旱类型/环境因子/木质部储水Key words
Larix principis-rupprechtii forest/sap flow/drought type/environmental factor/xylem water storage引用本文复制引用
刘铭,郭建斌,林雪雯,于松平,白铭悦,陈生钢..六盘山华北落叶松液流速率对干旱类型的响应[J].应用生态学报,2025,36(6):1690-1698,9.基金项目
本文由国家自然科学基金项目(32271959)、国家重点研发计划项目(2022YFF1300404)和宁夏自治区重点研发计划项目(2023BEG02049)资助. （32271959）
