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Compensatory growth responding to clipping: a case study in a subtropical grassland northeast of Chongqing(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2014 03
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Compensatory growth responding to clipping: a case study in a subtropical grassland northeast of Chongqing
WANG Mei FU Xiuqin SHI Fusun WANG Yanxing WANG Qian LU Tao WU Yan
1Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China 2University of Chinese Academy of Sciences, Beijing 100049, China 3Chengdu Vocational College of Agricultural Science and Technology, Chengdu 611100, China
clipping grassland in southern China ecosystem carbon exchange rate compensatory growth C storage Lolium perenne
S812 : Q948.1

In search of a sustainable clipping management system to improve the potential of carbon sequestration in order to win the priority to emit more carbons, four clipping managements of different intensities were experimented during the year 2012 in the Qishan Pasture of northeast Chongqing. We examined the responses of aboveground biomass (AB), aboveground C storage (AC), root biomass (RB), root C storage (RC), total biomass (TB), and total C storage (TC) across different levels of organization (i.e., species, plant functional group and community) as well as the net ecosystem exchange (NEE), ecosystem respiration (ER) and gross ecosystem productivity (GEP). The results demonstrated that 1) under light and heavy clipping intensities, AB of community increased by 32 g m-2 and 27 g m-2 respectively and its AC increased by 13 g m-2 and 9 g m-2, respectively, exhibiting over-compensatory growth. 2) The plant functional groups and their component dominant species responded differently to clipping. For grass, light, middle and heavy clipping treatments all significantly increased AB by 20%, 18% and 27%, and enhanced AC by 21%, 19% and 25% , respectively; for forbs, an increase of 72%, 45% and 22% in AB, and 71%, 46% and 22% in AC was found in the light, middle and heavy clipping treatment, respectively; for Fabaceae, light and middle clipping treatments significantly enhanced AB by 22% and 22%, and AC by 20% and 23%; however, Asteraceae exhibited under-compensation under three clipping intensities, with AB and AC reduced by 51-69% and 51-70%, respectively. 3) Clipping significantly reduced RB and RC, with a decrease of 9%, 10% and 19% in RB and 13%, 11% and 20% in RC found under light, middle and heavy clipping treatments respectively, which was contributed by the decrease in RB and RC of Dactylis glomerata and Artemisia dubia. 4) Though clipping exhibited little effect on TB and TC of community, TB and TC of different dominant species responded to clipping differently. Clipping significantly increased TB and TC of Lolium perenne, but decreased TB and TC of Artemisia dubia. Light, middle and heavy clipping increased TB of Lolium perenne by 24%, 28% and 82% and TC by 22%, 32% and 93%, but reduced TB of Artemisia dubia by 83%, 83% and 78% and TC by 83%, 84% and 78%, respectively. 5) Little difference of NEE, ER and GEP was found among the four different clipping intensity treatments at monthly or seasonal level, indicating that clipping did not affect TC of community. In sum, light clipping probably can enhance the primary productivity of grassland in short term; and planting Lolium perenne can help to improve carbon sequestration of grassland in southern China.


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