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《Journal of Arid Land Resources and Environment》 2017-09
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Water services of soil ecosystem provided by introduced grassland at arid season under humidity climate of southwestern China Karst Area

DONG Yingping;XIONG Kangning;LI Kaizhong;YAN Lihui;CHI Yongkuan;Guizhou Normal University,Institute of China South Karst;  
Since we challenged the concept of " grass-covered soil performed better than uncovered soil for water conservation",so we regarded introduced grasses in pots with local soil as minimum ecosystem unit,a series of observations were carried out to reveal whether the grasses contribute to water conservation under the drought stress in arid season of southwest China Karst. Results show that grassland did not guarantee a better soil moisture condition. On the contrary,it accelerated water loss of soil ecosystem. Water consumption of introduced grass community had reached as high as 1. 11 × 10~5t/km~2 and 6. 3 × 10~4t/km~2 within 10 days,which were much higher than uncovered grassland ecosystem as 5. 2 × 10~4t/km~2. Therefore,introduced grassland in winter in these area probably owns lower ecosystem services value than uncovered soil system.
【Key Words】: ecosystem services soil water minusing method introduced grassland ecosystem Karst
【Fund】: 国家十三五重点研发课题(2016YFC0502607);; 国家自然科学基金项目(41561047);; 国家青年基金项目(41301504)资助
【CateGory Index】: S812.2
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