Actual evapotranspiration(ETa)is a key component of water balance.This study aimed to investigate the spatial variability and time stability of ETa along a hillslope and to analyze the key factors that control the spa...Actual evapotranspiration(ETa)is a key component of water balance.This study aimed to investigate the spatial variability and time stability of ETa along a hillslope and to analyze the key factors that control the spatiotemporal variability of ETa.The potential evaporation,surface runoff and 0–480 cm soil water profile were measured along a 243 m long transect on a hillslope of the Loess Plateau during the normal(2015)and wet(2016)water years.ETa was calculated using water balance equation.Results indicated that increasing precipitation during the wet water year did not alter the spatial pattern of ETa along the hillslope;time stability analysis showed that a location with high time stability of ETa could be used to estimate the mean ETa of the hillslope.Time stability of ETa was positively correlated with elevation(P<0.05),indicating that,on a hillslope in a semi-arid area,elevation was the primary factor influencing the time stability of ETa.展开更多
基金the Programme of Introducing Talents of Discipline to Universities of China(D18013)the independent subject of State Key Laboratory of Plateau Ecology and Agriculture,Qinghai University,China(2019-ZZ-05)+3 种基金the Project of Qinghai Science&Technology Department(2019-ZJ-Y01)the Natural Science Foundation of Qinghai Province,China(2020-ZJ-967Q)the Thousand High Innovative Talents Program of Qinghai Province(2019)the Program for Changjiang Scholars and Innovative Research Team in University,Ministry of Education,China(IRT_17R62).
文摘Actual evapotranspiration(ETa)is a key component of water balance.This study aimed to investigate the spatial variability and time stability of ETa along a hillslope and to analyze the key factors that control the spatiotemporal variability of ETa.The potential evaporation,surface runoff and 0–480 cm soil water profile were measured along a 243 m long transect on a hillslope of the Loess Plateau during the normal(2015)and wet(2016)water years.ETa was calculated using water balance equation.Results indicated that increasing precipitation during the wet water year did not alter the spatial pattern of ETa along the hillslope;time stability analysis showed that a location with high time stability of ETa could be used to estimate the mean ETa of the hillslope.Time stability of ETa was positively correlated with elevation(P<0.05),indicating that,on a hillslope in a semi-arid area,elevation was the primary factor influencing the time stability of ETa.
文摘为探讨不同育苗容器对降香黄檀苗木生长的影响,以森林土与咖啡壳沤制物按1∶1混合作为栽培基质,比较5种育苗容器对2年生降香黄檀苗高、地径、各器官生物量、主根长度、>0.1 cm侧根数、最长侧根长度、苗木质量指数的影响,并采用隶属函数分析法进行综合评价。结果表明:2年生降香黄檀在不同育苗容器间苗高、地径、各器官生物量、主根长度、苗木质量指数有显著差异,高径比、侧根数、最长侧根长度则差异不显著;隶属函数综合分析得出适宜2年生降香黄檀生长的容器为无纺布育苗袋(D×H=20 c m×25 cm),其各项生长指标均比其它容器苗高,苗木质量指数也最高,可推荐为苗圃生产用的优良栽培容器。
