干旱区生态环境知识资源中心(Arid): The dynamics of soil moisture balance components and their relations with the productivity of natural vegetation in an arid region of northwestern China

Arid

DOI	10.1016/j.ecoleng.2019.105672
	The dynamics of soil moisture balance components and their relations with the productivity of natural vegetation in an arid region of northwestern China
	Li, Danfeng; Shao, Mingan; Zhang, Shuaipu; Zhang, Kun
通讯作者	Li, DF (corresponding author), Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China.
会议名称	12th International Congress of Ecology (INTECOL)
会议日期	AUG 21-25, 2017
会议地点	Beijing, PEOPLES R CHINA
英文摘要	Precipitation and groundwater are important water source in soil and are vital for the survival and growth of natural vegetation in arid regions. Analyses on the dynamics of soil water balance components and their relations with plant growth are usually restricted by the lack of continuous measurement of deep soil moisture at a local or regional scale. By monitoring monthly soil water contents in the 0-3 m soil profiles, we analyzed the contributions of precipitation and groundwater to the growth of natural vegetation in an arid region of northwestern China from 2011 to 2013. The results showed that the 0-3 m desert soil and the 0-1.8 m grassland soil exhibited moderate spatial variability in the soil water contents (theta). Temporal variability of spatial mean. decreased with depth in the soils of the desert and grassland. The profile-average of spatial mean. maintained 0.11 cm(3) cm(-3) in the desert and varied from 0.37 to 0.44 cm(3) cm(-3) in the grassland over time. The evapotranspiration after calibration gave accurate estimation of water available for plants (402.0 and 532.4 mm year(-1) in the desert and grassland, respectively). Annual mean net primary productivity of the grassland (233.4 g C m(-2)) was 3.8 times that of the desert. Water exchange in the desert soils was dominated by recharge into the 0-1 m soil from layers deeper than 3 m, with annual mean value of 303.4 mm. Recharge alternated with discharge events in grassland soils. Annual mean recharge and discharge amounts were 494.2 and 50.1 mm for the 0-1 m layer and 641.1 and 228.9 mm for the 0-3 m soil profile, respectively. Water supply into soil was totally consumed by evapotranspiration. Precipitation use efficiency increased when groundwater level became shallow (0.04 and 0.11 g C m(-2) mm(-1) in the desert and grassland, respectively). Groundwater supplied about 75% of water requirement for natural vegetation, and its use efficiencies were 0.12 and 0.33 g C m(-2) mm(-1) in the desert and grassland, respectively. Seedling of herbaceous species with trichomes at the interspace and under the canopy of shrubs can guarantee great utilization of precipitation in the desert. Transplanting of shrubs with large amounts of shallow lateral roots and shrubs with deep rooting systems can effectively utilize the shallow and deep soil water or groundwater. Reducing the irrigation consumption of groundwater and controlling the expansion of oasis cropland are foremost to guarantee the ecological water requirement and maintain the sustainability of natural ecosystems. Keep or increase current area and layout of the grassland may benefit the water cycle and carbon sequestration in the arid regions.
英文关键词	Soil moisture Soil water balance Evapotranspiration Ecological water requirement
来源出版物	ECOLOGICAL ENGINEERING
ISSN	0925-8574
EISSN	1872-6992
出版年	2020
卷号	143
出版者	ELSEVIER
类型	Article; Proceedings Paper
语种	英语
国家	Peoples R China
收录类别	CPCI-S
WOS记录号	WOS:000505931400027
WOS关键词	WATER-USE ; PRECIPITATION PULSES ; DIFFERENT LANDSCAPES ; TROPICAL SAVANNA ; TEMPERATE DESERT ; CARBON FLUXES ; SAP FLOW ; ECOSYSTEM ; GROUNDWATER ; AVAILABILITY
WOS类目	Ecology ; Engineering, Environmental ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology ; Engineering
资源类型	会议论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/313854
作者单位	[Li, Danfeng] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China; [Shao, Mingan] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China; [Zhang, Shuaipu] Guilin Univ Technol, Collaborat Innovat Ctr Water Pollut Control & Wat, Guilin 541004, Peoples R China; [Zhang, Kun] Minist Ecol & Environm China, Nanjing Inst Environm Sci, Nanjing 210042, Peoples R China
推荐引用方式 GB/T 7714	Li, Danfeng,Shao, Mingan,Zhang, Shuaipu,et al. The dynamics of soil moisture balance components and their relations with the productivity of natural vegetation in an arid region of northwestern China[C]:ELSEVIER,2020.