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Xinjiang Agricultural University (新疆农业大学) 2017

Effects of Enclosure on Characteristics of Vegetation and Soil Organic Carbon,Nitrogen Fractions in Sandy Desert Grassland

杨静

Titre : Effects of Enclosure on Characteristics of Vegetation and Soil Organic Carbon,Nitrogen Fractions in Sandy Desert Grassland

Auteur : 杨静

Grade : Master’s Theses 2017

Université : Xinjiang Agricultural University (新疆农业大学)

Résumé partiel
In order to provide a scientific basis for the restoration and sustainable development of sandy desert grassland,the influence of enclosure years(including 0 year,3 year,5 year and 8 year)on grassland community characteristics,stability,plant diversity,soil nutrients and active organic carbon and nitrogen(soil readily oxidized organic carbon,particle organic carbon and nitrogen,microbial biomass carbon and nitrogen)in sandy desert grassland were studied,and the sensitive indicators for evaluating recovering effect were selected by the multi-factor analysis and regression between enclosure years and index of vegetation and soil characteristic,then find the optimal period of enclosure.The main results are as follows :(1)The species richness,Simpson index and Shannon-wiener index showed a trend of "up-down-up" with the increase of enclosure years,while the Pielou evenness index showed a decreasing trend.Constructive species Seriphidiam santolinum have important proportion all the time with in the enclosure.The important values of Ceratocarpus arenarius were decline and the importance values of Salsola collina Pall were increased with increase of enclosure years.The community stability showed that 8-year enclosure was superior to 5-year enclosure,that 5-year enclosure is greater than 3-year enclosure,and better than grazing.Therefore,the species diversity and stability are promoted with the increase of enclosure years.(2)The content of total carbon in the soil increased by 1.34%173.15%,and the content of organic carbon showed a trend of "up-down-up" after cultivating grassland.Total nitrogen decreased by 8.33%34.38%,0-50 cm soil layer total phosphorus and total potassium increased.

Mots clés : Years of enclosure ;Sandy desert ;Community characteristics ;Soil nutrient ;Fraction of organic carbon and nitrogen ;

Présentation (CNKI)

Page publiée le 2 avril 2022