Effect of Different Crop Rotation Systems on the Aggregates and Their SOC Accumulation in Paludalfs in North Huai Region,China

Abstract

Abstract: Paludalfs under different crop rotation systems in North Huai region,China were sampled and soil aggregates were separated by ultra sonic dispersion followed by sedimentation and centrifuging.The particle size distribution,SOC (Soil organic matter) contents and the natural abundance of¹³C in these aggregates were studied.Significant difference in size of the aggregates and organic carbon storage in the studied soils were found after 5 years of the crop rotation on the soil.SOC was mainly found in 0.02～0.25mm fraction of aggregates in the soils.The aggregates in layers deeper than 35cm became coarse and richer in SOC under corn peanut sweet potato rotation.Young carbon derived from corn tended to be accumulated in the coarse fractions as revealed by heavier stable carbon composition in those aggregates from deep layer under the rotation system containing corn crop.Compared to the soil under think pine forest,All soils under crop rotation system showed rapid increase of SOC at rates ranging from 0.14C g·kg·a^-1 to 0 22C g·kg·a^-1 ,with the highest under corn peanut sweet potato system.Thus,the significance was indicated for increasing SOC storage by crop rotation in paludalfs and for reinforcing terrestrial carbon retention of atmospheric CO₂.

Key words: soil fauna, alpine/subalpine forest, litter, mass loss.

CLC Number:

S155.2⁺6

Zhang Xuhui, Li Lianqing, Pan Genxing. Effect of Different Crop Rotation Systems on the Aggregates and Their SOC Accumulation in Paludalfs in North Huai Region,China[J]. cje, 2001, (2): 16-19.

References

[1] 潘根兴,黄瑞采,丁瑞兴,等.淮北白浆土发育与晚第四纪古地理环境变化[J].第四纪研究,1995,(3):249-257.
[2] 潘根兴.中国土壤有机碳和无机碳库量研究[J].科技通报,1999,15(5):48-52.
[3] 柯建国,张光远.土壤-作物资源多目标优化配置分析[J].南京农业大学学报,1999,22(2):10-14.
[4] 中国科学院南京土壤研究所.土壤理化分析[M].上海:上海科学技术出版社,1981.
[5] 谭正喜,李家金,张红娣,等.淮北白浆土生产障碍性分析[A].见:王义炳.淮北白浆土综合治理和利用研究[C].北京:北京农业大学出版社,1993.7-12.
[6] 李恋卿,潘根兴,张旭辉,等.退化红壤植被恢复中表层土壤团聚体及其有机碳的分布变化[J].土壤通报,2000,31(5):193-195.
[7] 李家金,谭正喜,章安康,等.白浆土有机质组成及其在肥力演变过程中的变化[A].见:王义炳.淮北白浆土综合治理和利用研究[C].北京:北京农业大学出版社,1993.30-35.
[8] L iu H engyi,et al.So ils and environm en tal p rob lem s and strat2egy of su stainab le ag ricu ltu re in Donghai Coun ty,J iangsu,Ch ina[A].In:Sh i Yuanchun(ed s).In teg rated R esou rce M an2agem en t fo r Su stainab le A g ricu ltu re[C].Beijing:Beijing A 2[1] 潘根兴,黄瑞采,丁瑞兴,等.淮北白浆土发育与晚第四纪古地ricu ltu ral U n iversity P ress,1944.436-440.
[9] Lal,R.W o rld so ils and g reenhou se effect[J].IGB P N eslet2ter,1999,37:4-5.
[10] Scho les,B.W ill the terrestrial carbon sink satu rate soon[J].IGB P N esletter,1999,37:2-3.
[11] Buyanovsky,G.A.and W agner,G.H.R esidue decom po sitionand carbon in p hysical fraction s of so il[J].T rans.In tern l.S oil[1] 潘根兴,黄瑞采,丁瑞兴,等.淮北白浆土发育与晚第四纪古地ci.Cong r.A cap u lca,M ex ico,1994,19:253-262.
[12] H assink,J.P reservation of p lan t residues in so ils d iffering inun satu rated p ro tective cap acity[J].S oil S cience S ociety A m er2ica J ou rna l,1996,60:487-491.
[13] H un ting ton,Carbon sequestration in an agg rad ing fo rest e2co system in the sou thern U SA[J].S oil S cience S ociety A m er2ica J ou rna l,1995,59:1459-1467.
[14] Zd ru li,P.et al.O rgan ic carbon con ten t and rates of sequestra2tion in so ils of A lban ia[J].S oil S cience S ociety of A m erica[1] 潘根兴,黄瑞采,丁瑞兴,等.淮北白浆土发育与晚第四纪古地ou rna l,1995,59:1684-1687.
[15] Puget,P.et al.Carbon and young carbon in so il agg regates of silty cu ltivated so il[J].T rans.In tern l.S oil S ci Cong r.A ca2[1] 潘根兴,黄瑞采,丁瑞兴,等.淮北白浆土发育与晚第四纪古地u lca,M ex ico.,1994,19:288-290.