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Northwest A&F University (2020)

Efficiency and Mechanism of Soil Inorganic Carbon Accumulation Following Vegetation Restoration of Shelter Forest in Mu Us Sandy Land

蒋小董;

Titre : Efficiency and Mechanism of Soil Inorganic Carbon Accumulation Following Vegetation Restoration of Shelter Forest in Mu Us Sandy Land

Auteur : 蒋小董;

Grade : Master’s Theses 2020

Université : Northwest A&F University

Résumé partiel
The soil inorganic carbon pool following vegetation restoration in desert region may be a potential carbon sink and also a key component of understanding the carbon cycle process of terrestrial systems.Therefore,we selected the quick sand,semi-fixed sandy land,15~54a shrub and arbor windbreak and sand-fixing forest of Mu Us sandy land as the research objects.The evolution characteristics of soil inorganic carbon(SIC)and water-soluble inorganic carbon(WSIC)and the accumulation and distribution of SIC in soil sand,silt and clay were analyzed during the restoration of sand-fixing forest ;The content andδ13C of SIC and soil organic carbon(SOC)was determined to analyzed the relationship between SOC and SIC and its transfer law,the proportion of Pedogenic carbonates in SIC was obtained ;the soil physical-chemical factors were determined to revealed the factors affecting the accumulation of soil inorganic carbon,This study deeply understand the ecological restoration process of semi-arid desertification and provides scientific basis for the carbon cycle mechanism.The main results are as follows :(1)Studies on SIC content,density evolution and its component distribution show that:The content of SIC and WSIC in shelter forest exhibit an increasing trend with the age of the forest.From 0~10 cm to 80~100 cm,the SIC content of the 54a shrub forest was 5.04 and 4.47times that of the quicksand,and the 54a arbor forest was 29.44 and 11.30 times the quicksand.The WSIC of shelter forest is significantly higher than quicksand and the difference between soil layers is not significant.Compared to the quicksand,the average WSIC increment of 15-54a shrub forest was 4.17~12.01 mg/kg,and the increment in 26-54a arbor forest was4.69~16.96 mg/kg.The density of SIC and WSIC and their content showed a similar pattern,the SIC density from quicksand to 54a shrub forests in 0~10 cm and 0~100 cm layers increased by 0.22 Mg/hm2and 1.59 Mg/hm2,respectively,54a arbor forest increased 1.4 Mg/hm2、7.16Mg/hm2,respectively.The SIC in sand,silt,and clay of arbor forest in 0~10 cm and 10~20 cm increased significantly with the forest age,the largest concentration of SIC in all sizes particles of shrub is at 46a.The maximum and minimum components of SIC contributed to total SIC in shelter forestare silt inorganic carbon and water-soluble inorganic carbon,with their average contribution ratios of 59.98%and 1.32%,respectively.(2)Studies on the correlation between SOC and SIC and its transfer laws in sand-fixing forests show that :

Mots clés : Artificial sand-fixing forest; Soil inorganic carbon; δ13C; Soil particle; Vegetation restoration

Présentation (CNKI)

Page publiée le 27 mars 2022