Water Use Strategy of Salix cheilophila Stands with Different Ages in Gonghe Basin, Qinghai Province

LIU Li-ying; JIA Zhi-qing; ZHU Ya-juan; LI Hong; YANG De-fu; WEI Deng-xian; ZHAO Xue-bin

Salix cheilophila is one of the main shrub species for afforestation in Alpine Sandland of Gonghe Basin, Qinghai Province. Stable isotope technique was used to test the δD and δ18O value of rain, well water, branch xylem and different soil depth of 5-,9- and 25-year-old S. cheilophila plantation, and then the differences of main water source among the three S. cheilophila stands with different ages were analyzed. Also, the δ13C value of leaves was tested to evaluate the water use efficiency (WUE) of the S. cheilophila stands. Comparison of δD and δ18O showed that 5-year-old S. cheilophila used the water in 10-50 cm soil infiltrated from rainwater; 9-year-old S. cheilophila consumed relatively deep soil water, including 20 cm infiltrated from rainwater and 30-50, 150 cm replenished by ground water; and 25-year-old S. cheilophila used 10-20 cm soil water infiltrated from rainwater and 50 cm soil water replenished by ground water. The difference of leaf δ13C value among 5-, 9- and 25-year-old S. cheilophila stands was significant; 5-year-old S. cheilophila has exclusively high WUE, whereas that of 9-year-old and 25-year-old stands were similar. The water source and WUE suggest that 9-25 years old S. cheilophila was in steady period.

1. Institute of Desertification Studies, Chinese Academy of Forestry, Qinghai Gonghe Desert Ecosystem Research Station, Beijing 100091, China

2. Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China

3. Sand Control Experimental Station of Qinghai Province, Gonghe 813005, Qinghai, China

Received Date: 2011-04-02

Available Online: 2012-10-11

Abstract: Salix cheilophila is one of the main shrub species for afforestation in Alpine Sandland of Gonghe Basin, Qinghai Province. Stable isotope technique was used to test the δD and δ18O value of rain, well water, branch xylem and different soil depth of 5-,9- and 25-year-old S. cheilophila plantation, and then the differences of main water source among the three S. cheilophila stands with different ages were analyzed. Also, the δ13C value of leaves was tested to evaluate the water use efficiency (WUE) of the S. cheilophila stands. Comparison of δD and δ18O showed that 5-year-old S. cheilophila used the water in 10-50 cm soil infiltrated from rainwater; 9-year-old S. cheilophila consumed relatively deep soil water, including 20 cm infiltrated from rainwater and 30-50, 150 cm replenished by ground water; and 25-year-old S. cheilophila used 10-20 cm soil water infiltrated from rainwater and 50 cm soil water replenished by ground water. The difference of leaf δ13C value among 5-, 9- and 25-year-old S. cheilophila stands was significant; 5-year-old S. cheilophila has exclusively high WUE, whereas that of 9-year-old and 25-year-old stands were similar. The water source and WUE suggest that 9-25 years old S. cheilophila was in steady period.

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Reference (17)

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Water Use Strategy of Salix cheilophila Stands with Different Ages in Gonghe Basin, Qinghai Province

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