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Accueil du site → Doctorat → Chine → 2020 → A Study on the Process,Rate and Benefits of Carbon Sequestration of Planted Sand-fixing Vegetation in Shiyang River Basin

Lanzhou University (2020)

A Study on the Process,Rate and Benefits of Carbon Sequestration of Planted Sand-fixing Vegetation in Shiyang River Basin

王新友;

Titre : A Study on the Process,Rate and Benefits of Carbon Sequestration of Planted Sand-fixing Vegetation in Shiyang River Basin

Auteur : 王新友;

Grade : Doctoral Dissertation 2020

Université : Lanzhou University

Résumé partiel
Desert grassland is one main utilizable land type in northern China and is seriously threatened by desertification.The main measures for protecting and stabilizing it are planting sand-fixing vegetation like Haloxylon ammodendron.Over the years,the effect of doing so on preventing and controlling desertification and stabilizing the grassland has gained the approval of governments,people and scholars.However,the effect of such vegetation on carbon sequestration has long been ignored and the full and reliable empirical data concerning it is still lacking.Shiyang River basin is located in an environmentally fragile and climatically sensitive area,one of the earliest desert grasslands to control desertification and grow sand-fixing vegetation.The desertification and growing sand-fixing vegetation in the basin are typical of arid areas in China.This research is mainly conducted on three levels,experiment,simulating with a model,and verification.Firstly,with the sand-fixing vegetation in the basin as the research objects,this study calculated the current carbon stock by such vegetation in the basin,and revealed the process,regularity and rate of sequestrating carbon by typical planted sand-fixing vegetation—H.ammodendron,by using plots.It also analyzed the impact of wind erosion and dust fall on carbon sequestration by planted H.ammodendron.In addition,based on the type II forest inventory data of Gansu province,the author used Carbon Benefits Project-Modelling Tools(CBP)to simulate and predict the carbon sequestration benefits of sand-fixing vegetation in the basin,its future change in carbon stock,and its potential in carbon sequestration against enclosure and reconverting cultivated land to forestry.At last,the simulation has verified by the measured results of carbon storage of artificial sand-fixing vegetation in Shiyang River Basin in field.The major results are as follows.Firstly,growing sand-fixing vegetation significantly increased the organic carbon stock of the vegetation and soil in arid desertified areas,with the most evident increase in that in the surface soil at the depth between 0 and 5 centimeters.The carbon stock of the 35th-year H.ammodendron reached 0.75 Kg C/m 2,and its average carbon sequestration rate was 0.02 Kg C/m 2/a,25 times that of migratory dunes.Its carbon sequestration rate was similar to that of the stable sand-fixing Nitraria tangutorum shrubs in the same areas,while its carbon stock was only 1/3 of that of the latter.The carbon stock in the soil of the 35th-year H.ammodendron reached 2.48 Kg C/m 2,and its average carbon sequestration rate was 0.07 Kg C/m 2/a,3.5 times that of migratory dunes.However,the rate was only 29.4%of that of stable sand-fixing Nitraria tangutorum shrubs.The stock of organic carbon in the soil system of the35th-year H.ammodendron was up to 3.23 Kg C/m 2,and its average rate for sequestrating carbon was 0.09 Kg C/m 2/a,3.4 times more than that of migratory dunes.However,the rate only accounted for 35.1%of that of stable sand-fixing Nitraria tangutorum shrubs.Evidently,typical planted sand-fixing H.ammodendron has greater capacity for carbon sequestration.Secondly,the carbon stock of the above-ground planted H.ammodendron increased first with the increasing afforestation years and decreased later

Mots clés : H.ammodendron sand-fixing vegetation; carbon sink; carbon stock; Carbon Benefits Project-Modelling Tools;

Présentation (CNKI)

Page publiée le 15 juin 2021, mise à jour le 21 octobre 2021