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《Grassland and Turf》 2016-05
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Effect of different management patterns on seasonal dynamics of soil microbial biomass in the alpine meadow

JIANG Yong-mei;YAO Tuo;TIAN Yong-liang;YANG Hui-hui;ZHANG Jian-gui;GAO Ya-min;WEI Chang-hua;ZENG Xiao-xia;YAN Cai-xia;ZHANG Biao;College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem,Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province/Sino-U.S.Centers for Grazingland Ecosystem Sustainability;  
Seasonal dynamics of soil microbial biomass carbon(SMBC),soil microbial biomass nitrogen(SMBN)and soil microbial biomass phosphorus(SMBP)were tested and analyzed with the chloroform fumigation extraction method in alpine meadow in Maqu under different management measures.The main results obtained as follows:1)in the same month and soil depth,soil microbial biomass shown a decreasing tendency(enclosure+reseeding enclosure+fertilization enclosure no-fence);2)in same month and management measures,soil microbial biomass with different soil depth(0to 20 cm or 20 to 40cm)shown a decreasing tendency(0to 20 cm 20 to 40cm),they were much greater(1.16 to 3.13times)in 0 to 20 cm soil depth than that in 20 to 40cm;3)in same management measures and soil depth(0 to 20 cm or 20 to 40cm),the seasonal trend of soil microbial biomass reached the peak in July and then declined,the differences among months were significant;4)in same management measures,the seasonal dynamics of soil microbial biomass with the different month and soil depth(0 to 20 cm or 20 to 40cm)shown a decreasing tendency(0 to 20 cm 20to 40cm).Soil microbial biomass was significantly related with temperature(P0.010),and positively correlated with precipitation.The synthetic index method was used to calculate a soil quality index under different management patterns,the tendency of the values of the soil quality indices was as follows:enclosure+reseeding(0.193) enclosure+fertilization(0.096) enclosure(-0.059) no-fence(-0.231).It could be concluded that the enclosure+reseeding was the best for the ecological restoration of alpine meadow.
【Fund】: 国家自然基金(31360584)资助
【CateGory Index】: S812.2
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