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白龙江干旱河谷自然恢复灌丛群落的土壤碳氮储量

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【目的】研究白龙江干旱河谷灌丛自然恢复过程中土壤有机碳和全氮储量的动态特征。【方法】在甘肃舟曲白龙江干旱河谷自然恢复灌丛群落中布设样地,开展群落调查和土壤分层取样,采用环刀法测量土壤容重、采用重铬酸钾外加热法测定土壤有机碳含量,用半微量凯氏法测定土壤全氮含量。【结果】随着灌丛群落自然恢复时间的增长,土壤有机碳储量、全氮储量明显增加。土壤有机碳储量从恢复5 a时的58.18 Mg/hm2,经82.48 Mg/hm2(8 a)、127.24 Mg/hm2(15 a),逐步增加到原生阶段的213.41 Mg/hm2;全氮储量从4.42 Mg/hm2(5 a),经5.75 Mg/hm2(8 a)、6.59 Mg/hm2(15 a),增加到原生阶段的11.85 Mg/hm2;土壤碳氮比在5 a、8 a、15 a、原生阶段分别为13.15、14.35、19.31、18.00。【结论】随着干旱河谷灌丛群落的自然恢复,其土壤结构改善明显,有机碳储量和全氮储量增加明显,干旱河谷灌丛群落土壤储碳潜力较大。
Soil Carbon and Nitrogen Qeserves of Shrubs in the Bailongj iang Dry Valley,Gansu Province
Obj ective]The obj ective of this study was to clarify the dynamics of soil organic carbon and nitrogen of different shrub communities in the Bailongjiang dry valley,Gansu province.[Method]Soil samples were collected from shrubs in the in the Bailongjiang dry valley of Gansu province.Soil bulk density was measured by ring-knife.Soil organic carbon was determined by potassium dichromate oxidation titration.Soil total nitrogen was analyzed by Kjeldahl nitrogen determination.[Results]With the increase of natural recovery time,the storages of soil organic carbon and total nitrogen increased significantly.Soil organic carbon was 58. 18 Mg/hm2 ,82. 48 Mg/hm2 ,127. 24 Mg/hm2 and 213. 41 Mg/hm2 ,respectively,in 5 a,8 a,15 a and primary stage. Soil Nitrogen was 4. 42 Mg/hm2 ,5. 75 Mg/hm2 ,6. 59 Mg/hm2 ,11. 85 Mg/hm2 ,respectively,in 5 a,8 a,15 a and primary stage.Moreover,the ratio of organic carbon to nitrogen was 13. 15, 14. 35,19. 31 and 18. 00 respectively,in 5 a,8 a,15 a and primary stage.[Conclusion]Soil bulk density decreased with increasing vegetation restoration ages and soil organic carbon and nitrogen increased with vegetation restoration.

dry valleyvegetation restorationsoil organic carbonsoil total nitrogenC/N

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甘肃省土地开发整理中心,兰州_730000

干旱河谷 植被恢复 土壤有机碳 土壤全氮 碳氮比

四川省教育厅项目

11ZA291

2014

四川农业大学学报
四川农业大学

四川农业大学学报

CSCD北大核心
影响因子:0.657
ISSN:1000-2650
年,卷(期):2014.(3)
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