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Ningxia University (2019)

Effects of Different Restoration Measures on the Soil Structure、Organic Carbon and Nitrogen Characteristics in Desert Steppe Ecosystem

于双;

Titre : Effects of Different Restoration Measures on the Soil Structure、Organic Carbon and Nitrogen Characteristics in Desert Steppe Ecosystem

Auteur : 于双;

Grade : Master’s Theses 2019

Université : Ningxia University

Résumé
To understanding the soil structure and the characteristics of carbon and nitrogen of desert steppes with different restoration measures,we selected the desert steppes of deep tillage+reseed(S),shallow ploughing+reseed(Q),no-till+reseed(M),fenceing(F)4 and traditional grazing(CK)as the research object.The soil aggregate composition,soil organic carbon and total nitrogen in the soil profile and distribution of different particle size of aggregate,the changes of organic carbon and nitrogen components at 0-40 cm depth were studied.The influences of different restoration measures on soil structure and carbon and nitrogen characteristic in desert steppe were analyzed.The main conclusions are as follows :(1)The mechanical stability and water stability aggregates of 0-40cm soil layer under different treatments were all microaggregates of<0.25mm as the dominant particle size,and the water stability of large aggregates content(WR0.25)was significantly lower than that of the mechanical stability of large aggregates content(DRO 25).The dry sieve DR0 25,MWD,GMD of 0-40cm soil layer and WR0 25 of 10-30cm soil layer were the highest in shallow tillage grassland.With the deepening of soil layer,the contents of<0.25mm micro aggregates of the mechanical stability and water stability of the grasslands under different treatments decreased,and the soil structure tended to be stable.(2)The soil organic carbon content at the 0-30 cm soil layer and the total nitrogen content at the 0-20cm soil layer were the highest in the shallow ploughing grassland with 9.93-14.90 g/kg and 0.17-0.22 g/kg respectively.The soil carbon and nitrogen reserves at 0-40cm depth were the highest in ploughing grassland(47.72 and].09 t/hm2,respectively).(3)The organic carbon content of the aggregates at the 0-10cm soil layer was the highest in the grazing grassland,and the variation range was 0.99-2.41 g/kg.At the 10-40cm soil layer,they were the highest in shallow ploughing grassland,followed by deep tillage and no-tillage grassland,and fencing and grazing grassland were lower.The total nitrogen contents of the aggregates changed irregularly at the 0-40cm soil layer.

Mots clés : desert steppe; restoration measures; aggregate stability; organic carbon; total nitrogen; carbon and nitrogen components;

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Page publiée le 26 mai 2020