Huang, Yibin

Wang, Y. X.

Weng, Boqi

Wu, Z. D.

Zheng, Z. D.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Effects of Orchard Green Cover on Accumulation and Emission of Soil Organic Carbon Y. X. Wang Fujian Academy of Agricultural Science, China Boqi Weng Fujian Academy of Agricultural Science, China Z. D. Wu Fujian Academy of Agricultural Science, China Yibin Huang Fujian Academy of Agricultural Science, China Z. D. Zheng Fujian Academy of Agricultural Science, China Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/8-1/40 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]908　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Climate Change and Impact on Grasslands/RangelandsEffects of orchard green cover on accumulation and emission of soil organic carbonY . X . W ang , B . Q . Weng , Z . D . Wu , Y . B . H uang , Z . D . ZhengInstitute o f A gricultural Ecology , Fuj ian A cademy o f A gricultural Science , Fuz hou , Fuj ian 350013 , ChinaE‐mail : sd ＿ wolong＠ 163 .comKey words : orchard green cover , soil , organic carbon , soil respirationIntroduction Agriculture is an important emission source of greenhouse gases ( GHG) . The emission amount of GHG from theland use changes reached １ .６ × １０１５ g every year , which was the secondary important source of GHG ( Houghton ,１９９５) . Howto effectively control the agricultural emission amount of GHG has become an urgent problem . This paper preliminarily studiedthe effects of orchard green cover on characteristics of soil organic carbon to provide a reference for exploring the technology ofGHG mitigation .Materials and methods Two treatments were imposed in split‐block experimental design with ３ replicates . T reatments wereintercropping Chamaecrasta rotundi f olia in orchards and weed‐cleaning orchards . Plots were arranged randomly with the areain size of ４m × ２５m .Results Compared with the control group , the total content of soil organic carbon ( in ０ ～ ２０ cm soil layer) , humic acid contentand fulvic acid content in intercropped herbage orchards increased ３７ .２５％ , １５３ .７８％ and ６ .７６％ , respectively ( Figure １ ) .Daily change regularity of soil respiration rate in intercropped herbage orchards was similar to that in the control group . Therespiration rate of soil reached the lowest at ８ : ００ am , then increased gradually , subsequently reached the maximum value at２０ :００ pm , then decreased gradually . However , the soil respiration rate in intercropped herbage orchards was １ .１５％ ～ ４４ .２３％ higher than the control group ( Figure ２ ) .Figure 1 The changes o f organic carbon andcompositions o f soil .Figure 2 The changes o f soil resp iration rate .Conclusions Planting herbages in orchards is an advanced and high efficiency soil management means , which has been widelyapplied in Europe , USA and Japan in recent years , and has a remarkable effect in preventing soil erosion especially . Orchardgreen cover could enhance the N‐fixing ability of soil and improve the stability of soil organic carbon . The released rate of CO２in intercropped herbage orchards was higher than in weed‐cleaning orchards , which could be explained by root respiration . Theeffects of orchard green cover on soil heterotrophic respiration will be continued further .ReferenceHoughton R . A １９９５ . Land‐use change and the carbon cycle . Global Change Biology , １ : ２７５‐ ２８７ .:J 0 □ CK ■ Grass model 25 N a 20 .c ~ -:::; 15 '""" co ':c: 10 e=: 5 0 Humic acid Fu Iv i c acid Organic carhon 2. 5 C 2 er; 0. fj --+--CK - --o- -Grass I I I .o-0 p~ 0 2 4 6 8 10 12 14 16 18 20 22 Time 

Effects of Orchard Green Cover on Accumulation and Emission of Soil Organic Carbon

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Effects of Orchard Green Cover on Accumulation and Emission of Soil Organic Carbon

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