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[1]WANG Yunni,HE Cong,XIONG Wei,et al.The Water Use Characteristics of Three Representative Plant Communities and their Seasonal Variation in Liupan Mountains,Ningxia[J].Research of Soil and Water Conservation,2015,22(04):34-40.

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The Water Use Characteristics of Three Representative Plant Communities and their Seasonal Variation in Liupan Mountains,Ningxia

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 04 Page number: 34-40 Column: Public date: 2015-08-28

Title:: The Water Use Characteristics of Three Representative Plant Communities and their Seasonal Variation in Liupan Mountains,Ningxia

Author(s):: WANG Yunni¹, HE Cong², XIONG Wei¹, WANG Yanhui¹, YU Pengtao¹, TONG Hongqiang³; 1. Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forestry Ecology and Environment of State Forestry Administration, Beijing 100091, China;
2. Information Center, Hainan Forestry Department, Haikou 570203, China;
3. Yichun Water Conservancy Bureau, Yichun, Jiangxi 336000, China

Keywords:: evapotranspiration; water use; partitioning; T_r/ET; plantation; grassland

CLC:: S714.5

DOI:: -

Abstract:: To understand the characteristics of water use of vegetation and the relationship between water use and community structures in dryland, three typical types of vegetation including Larix principis-rupprechtii plantation, Hippophae rhamnoides plantation and natural grassland were selected to estimate the seasonal variations of transpiration (T_r), evapotranspiration (ET), water use efficiency (WUE) and their partitioning of vegetation by using thermal dissipation technique, micro lysimeter, dendrometer and document literature in the Diediegou catchment of Liupan Mountains, Ningxia. The results indicated that the ETs of three types of vegetation during the growing season arranged as:L. principis-rupprechtii forest (429.7) > H. rhamnoides forest (379.3) > grassland (206.9), respectively, greater than, almost equal to, less than the same period of rainfall. The total ETs of three types of vegetation showed a low-high-low seasonal trend. The T_t/ET ratios of two planted forests had remarkable difference with the order of L. principis-rupprechtii forest (48%) > H. rhamnoides forest (39%). The T_r/ET ratio of H. rhamnoides forest had the similar seasonal pattern with its ET, the highest was observed in September(50.4%), but the T_r/ET ratio of L. principis-rupprechtii forest decreased over time during the growing season. The order of the WUE of three types of vegetation during the growing season followed as:grassland (3.1 g/kg) > L. principis-rupprechtii plantation (2.7 g/kg) > H. rhamnoides plantation (2.35 g/kg). The WUE of L. principisrupprechtii forest decreased over time during the growing season. The WUE of tree layer of L. principisrupprechtii forest was 4.04 g/kg, while that of herbaceous layer was only 1.36 g/kg. The WUE of H. rhamnoides forest showed a high value in the early and middle of growing season, but a low values in the later growing season. And WUE of the shrub layer was 2.32 g/kg, while it was 2.37 g/kg for herbaceous layer. WUE of the natural grassland ranged 3.2 ~ 4.8 g/kg from May to August, then decreased to 0 in September. It is implied that plants do not use all of the precipitation input not only in water-sufficient season (the early and late stage of the growing season), but also in water-limited season (the medium stage of the growing season), and also showed interspecific difference.

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