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Ningxia University (2017)

Soil Properties and Seed Bank of 4 Kinds of Plant Communities in Desert Steppe Region

邵文山;

Titre : Soil Properties and Seed Bank of 4 Kinds of Plant Communities in Desert Steppe Region

Auteur : 邵文山;

Grade : Master’s Theses 2017

Université : Ningxia University

Résumé partiel
In this paper,the aboveground vegetation,soil characteristics and soil seed bank(SSB)of four kinds of plant communities(Community of Sophora alopecuroides,Community of Achnatherum splendens,Community of Artermisia ordosica,Community of Kalidium foliatum)were studied in desert steppe area of Ningxia Yanchi county by field investigation and laboratory experiment.The differences and correlation among aboveground vegetation,soil characteristics and seed bank of different 4 kinds of plant communities were compared respecitively.These results were helpful to reveal scientifically the successional law of plant communities in desert steppe,and provide some theoretical guidance for the management and restoration of degraded grassland.These results showed that:1.There were differences of 4 kinds of plant communities of aboveground part,such as species composition,life type and diversity characteristics.There were 15 species in S.alopecuroides community belonging to 7 families and 15 genera,respectively,in which Gramineae plants were accounted for one-third,and the number of perennial herb was 9.There were 14 species in A.splendens community belonging to 6 families and 11 genera,respectively.These species were mostly included Chenopodiaceae and Gramineae,in which 7 was the perennial herb.There were 10 species in A.ordosica community belonging to 6 families and 10 genera,respectively,in which Compositse and Gramineae account for half,and the difference of the plant life type were relatively high.There were only three species in K.foliatum community.The species evenness and stability of A.splendens community were higher,followed by S.alopecuroides community and A.ordosica community.The plants species of K.foliatum community were relatively single.2.There were discrepancies of the 4 kinds of plant communities about soil physical and chemical properties.For example,the soil bulk density was lower in S.alopecuroides community,but the total nitrogen and alkali-hydrolyzable nitrogen were higher.The pH and the organic carbon content of soil in A.splendens community were significantly higher than other communities.The soil moisture content and soil nutrients were lower in A.ordosica community.The salt content and the content of available P were relative higher in K.foliatum community.3.There were differences of 4 kinds of plant communities,such as soil enzyme activities,soil microbial quantity and their vertical distributions.The activities of soil urease and phosphatase in S.alopecuroides community and A.splendens community were higher.The activities of soil catalase in K.foliatum community were higher.The activities of soil phosphatase and sucrase were lower in A.ordosica community.The activities of urease,phosphatase and sucrase decreased with the increase of the soil layer in the 4 kinds of plant communities.However,the change of soil catalase were abnormal in K.foliatum community.The number of soil microorganisms in 4 kinds of plant communities showed a decrease trend with the deepening of the soil layer.It was the highest in S.alopecuroides community and was the lowest in A.ordosica community.4.There were differences of the 4 kinds of plant communities rearding species composition,seed density,distribution pattern and diversity characteristics of SSB.The number of species and seed density in A.splendens community were the highest,followed by S.alopecuroides community and A.ordosica community,and the lowest were the K.foliatum community.The seed density of dominant species in other three kinds of plant communities were low,except in S.alopecuroides community.

Mots clés : desert steppe; soil seed bank(SSB); aboveground vegetation; soil properties; soil enzyme activity;

Présentation (CNKI)

Page publiée le 24 janvier 2018