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| Effects of Grazing and Enclosure on Soil Respiration Rate in the Horqin Sandy Grassland |
| Sun Dianchao1,2, Li Yulin1, Zhao Xueyong1, Mao Wei1, Yue Xiangfei1,2 |
1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Grazing and enclosure recovery measurement are important factors to the change of sandy grassland ecosystem. Daily and seasonal variations of soil respiration rates were measured in 2013 to understand effects of continuous grazing and differently aged enclosures on soil respiration rate in the Horqin Sandy Grassland, and results showed that:(1) In the growing season, dynamic response of soil respiration for grazing and enclosure is not the same, at the early stage of plant growth, soil respiration rate of enclosed area is significantly greater than that of grazing area(p<0.05); In the late period of plant growth, soil respiration rate of grazing area is significantly greater than that in the enclosed area(p<0.05). In the early monitoring period, soil respiration rate of 17-year enclosed area is bigger than that of the 22-year enclosed area, but that is adverse in the late monitoring period, and the differences were both significant(p<0.05).(2) Seasonal dynamic responses of soil respiration rate to grazing and enclosure are similar, but soil respiration variation caused by enclosing is relatively small.(3) Soil respiration rate of seasonal dynamics for 22-year enclosed area is significantly greater than that in 17-year enclosed(p<0.05) and grazed area(p<0.01) respectively, and that of 17-year enclosed is greater than grazed area(p>0.05). Consequently, Enclosure can boost the emission of soil CO2, and long-term enclosure(22 years) has a bigger influence on soil CO2 emission rate than the relatively short-term enclosure(17 years).(4) Soil temperature and soil moisture can explain the variation of soil respiration rate in the order of grazing(58%)>enclosure 22(39%)>enclosure 17(28%).
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Received: 04 August 2014
Published: 20 November 2015
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2015, Vol. 35 
