Variable hydrological effects of herbs and shrubs in the arid northeastern Qinghai-Tibet Plateau, China Variable hydrological effects of herbs and shrubs in the arid northeastern Qinghai-Tibet Plateau, China

回到完整页面

Vol15 No.7: 1532-1545

Title】Variable hydrological effects of herbs and shrubs in the arid northeastern Qinghai-Tibet Plateau, China

Author】LIU Ya-bin1,2,3; ZHANG Ying4; FU Jiang-tao1,2,3; YU Dong-mei1,2 ; HU Xia-song1,4*; LI Xi-lai5; QI Zhao-xin1,2,3; LI Shu-xia1,2,3

Addresses】1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China; 2 Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes, Xining 810008, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China; 4 Department of Geological Engineering, Qinghai University, Xining 810016, China

5 College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China

Corresponding author】HU Xia-song

Citation】Liu YB, Zhang Y, Fu JT, et al. (2018) Variable hydrological effects of herbs and shrubs in the arid northeastern Qinghai-Tibet Plateau, China. Journal of Mountain Science 15(7). https://doi.org/10.1007/s11629-017-4411-2

DOI】https://doi.org/10.1007/s11629-017-4411-2

Abstract】This study aims to assess the hydrological effects of four herbs and four shrubs planted in a self-established test area in Xining Basinof northeastern Qinghai-Tibet Plateau, China. The Rainfall-InterceptingCapability (RIC) of the herbs and shrubs was evaluated in rainfall interception experiment at the end of the third, fourth and fifth month of the growth period in 2007. The leaf transpiration rate and the effects of roots on promoting soil moisture evaporation in these plants were also assessedin transpiration experiment and root-soil composite system evaporation experiment in the five month’s growth period. It is found that theRIC of the four studied herbs follows the order of E.repens, E.dahuricus, A.trachycaulum and L.secalinus; the RIC of the four shrubs follows the order of A.canescens, Z.xanthoxylon, C.korshinskii and N.tangutorum. The RIC of all the herbs is related linearly to their mean height and canopy area (R2 ≥ 0.9160). The RIC of all the shrubs bears a logarithmic relationship with their mean height (R2 ≥ 0.9164), but a linear one with their canopy area (R2 ≥ 0.9356). Moreover, different species show different transpiration rates. Of the four herbs, E.repens has the highest transpiration rate of 1.07 mg/(m2·s), and of the four shrubs, A.canescens has the highest transpiration rate (0.74 mg/(m2·s)). The roots of all the herbs and shrubs can promote soil moisture evaporation. Ofthe four herbs, the evaporation rate of E.repens root-soil composite system is the highest (2.14%), and of the four shrubs, the root-soil composite system of A.canescens has the highest evaporation rate (1.41%). The evaporation rate of the root-soil composite system of E.dahuricus andZ.xanthoxylon bears a second-power linear relationship with evaporation time (R2 ≥ 0.9924). The moisture content of all the eight root-soil composite systems decreases exponentially with evaporation time (R2 ≥ 0.8434). The evaporation rateand moisture content of all the plants’ root-soil composite systems increases logarithmically (R2 ≥ 0.9606) and linearly (R2 ≥ 0.9777) with root volume density. The findings of this study indicate that among the four herbs and four shrubs,E. repens and A. canescens possess the most effective hydrological effects in reducing the soil erosion and shallow landslide in this region.

Keywords】Plant hydrological effects; Rainfall interception capacity; Root-soil composite system; Transpiration rate; Moisture evaporation rate; Qinghai-Tibet Plateau