Characterization of dominant factors on evapotranspiration with seasonal soil water changes in two adjacent forests in the semiarid Loess Plateau

被引：17

作者：

Chen, Qiu-Wen ^{[1
,2
]}

Liu, Mei-Jun ^{[1
,2
]}

Lyu, Jinlin ^{[3
,4
]}

Li, Guoqing ^{[1
,3
]}

Otsuki, Kyoichi ^{[5
]}

Yamanaka, Norikazu ^{[6
]}

Du, Sheng ^{[1
,3
,7
]}

机构：

[1] Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Shaanxi, Peoples R China

[2] Northwest A&F Univ, Coll Forestry, Yangling 712100, Shaanxi, Peoples R China

[3] Chinese Acad Sci, Inst Soil & Water Conservat, Minist Water Resources, Yangling 712100, Shaanxi, Peoples R China

[4] Inst Bot Shaanxi Prov, Shaanxi Engn Res Ctr Conservat & Utilizat Bot Reso, Xian Bot Garden Shaanxi Prov, Xian 710061, Shaanxi, Peoples R China

[5] Kyushu Univ, Kasuya Res Forest, Fukuoka 8112415, Japan

[6] Tottori Univ, Arid Land Res Ctr, Tottori 6800001, Japan

[7] 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China

来源：

JOURNAL OF HYDROLOGY | 2022年 / 613卷

基金：

日本学术振兴会; 中国国家自然科学基金; 国家重点研发计划;

关键词：

Evapotranspiration patterns; Semiarid forests; Soil water storage threshold; Receiver operating characteristic curve (ROC); Loess Plateau; Dryland; BLACK LOCUST PLANTATION; SAP-FLOW; PRECIPITATION; MOISTURE; DROUGHT; TRANSPIRATION; REGION; CARBON; EVAPORATION; VARIABILITY;

D O I：

10.1016/j.jhydrol.2022.128427

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Evapotranspiration is an essential process of ecosystem water consumption and is controlled by meteorological factors and soil water conditions. In this study, evapotranspiration based on soil water budget was investigated with respect to major influencing factors during the growing seasons of 2012-2015 for two adjacent forest communities in the semiarid Loess Plateau region: a natural secondary forest dominated by oak (Quercus liao-tungensis) and a plantation of exotic black locust (Robinia pseudoacacia). Based on the combination of precipi-tation, soil water storage, and evapotranspiration dynamics, four distinct periods were differentiated to explore the evapotranspiration response to the main meteorological factors. The correlation matrixes showed that, in most investigated days, evapotranspiration was limited by soil water storage, while an increase in soil water storage shifted dominance from water-related to energy-related factors. The stepwise regression of >= 5-day dry events in each period had a better fitness when paired with the relationship between the summations of evapotranspiration and dominant factors (R2 > 0.7, p < 0.01 for all) than the stepwise results for daily averages. A receiver operating characteristic (ROC) curve was applied to validate the division and determine thresholds. All divisions were thoroughly validated, and the soil water storage thresholds of the black locust (120.2 mm and 150.7 mm) were higher than those of the oak (105.8 mm and 137.9 mm). Our results suggest that the oak had an adaptive water consumption strategy, while the black locust had a higher sensitivity to soil water insufficiency. The method for determining the threshold of soil water storage to separate the dominant factors of evapo-transpiration was validated. The approach may be applied to other semiarid forest communities with distinct evapotranspiration response patterns.

引用

页数：11

共 73 条

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