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1、Management Strategies and Their Evaluation for Carbon Sequestration in CroplandDENG Xiang?zheng1, 2*, HAN Jian?zhi1, 3, ZHAN Jin?yan4, ZHAO Yong?hong11.Institute ofGeographic Sci ences and NaturalResourcesResearch , Chinese Academy of Sciences (CAS), Beijing 100101; 2. Center forChinese Agricultural
2、Poli cy , CAS , Beijing100101 ; 3. Graduate University ofCAS, Beiji ng100049; 4 . StateKey Laboratory ofWaterEnviron?ment Smi ulati on , College of Resources Science Car bonsequestration incropl and ; Soilor ganic carbon ; Management of carbonsequestration ; Reducingcar ? bonemission ;Increasing car
3、bon sequestrationReceived: July 10, 2009? ? Accepted: August 25, 2009 SupportedbyNati onalNatur a lScienceFoundati onofChi na (70873118);the Chinese Academy ofSci ences (kzcx2?y w?305?2);the national key sci entific andtechnol ogi cal project ( 2006BAC08B03 , 2006BAC08B06, 2008BAC43B01). * Correspon
4、ding author . E?mai:l dengxz . ccap i gsnrr . ac . cn? ? W ith the more and more in?depth researches on global environ ment change ,the management strategies for carbon sequestration in cropl and have been wi dely given attention . Current researches show that the m issing of carbon most probabl y e
5、xists i n the terrestri al ecosyste m 1- 2.Although there are many literatures focus on the carbon sequestrati on of terrestrial ecosystem in China3- 4,researches on carbon cycle in cropland are relatively few. The managementmeas? ures for carbon sequestrati on i n cropl and affect the dyna m i c ch
6、anges of soil organic carbon ( SOC) to a greater exten.t The excessi ve recla mati on and mi proper manage ment will greatly reduce the SOC amountofcropl and so as to cause the massive emissi on ofCO2. Optmi ization of agricultural management measures can not onl y i ncrease the soil carbon sequestr
7、ati on ,mi prove the soil quality and enhance the agricultural producti vity ,but also reduce the soilandwater l oss , protect the bi otope landscape , etc .Itshoul d be noticed that the potential of carbon seques? tration in the top soil is not onl y influenced by the vegetati on condition ,environ
8、 mental temperature ,the co mpositi ons of soilm i nera,l weathered l ayerdepth , soildrai nage ,the availa? bility of water and air ,etc .,but also is controll ed by the chemical compositi on of soil organic matters and their resist? ance to them icrobialdegradation 5. When potentialofcarbon seques
9、tration in top soil is calculated ,the emission of CO2 shoul d be consi dered due to consuming fossil energy in the process of fertilizer production , water diversion irri gation , agri ? culturalmachi nery work ,etc .Therefore , more and more re? search efforts shoul d be made to explore the seques
10、trati on mechanis m and potential ofSOC content in the top soi,l and to formul ate the optmi al agri cultural management measures under local conditions so as to m i prove the potenti al ofcarbonsequestration in cropl and and miti gate the m i pacts from cli ? mate change in Chi na 6. Increasi ng th
11、e carbon storage of agro?ecosyste m is gen? erall y takenmeasures from two aspects : One is reduci ng the carbon l oss , whose mainmeasures contai n mi provi ng the en? ergy utilization rati o ,reduci ng the water and soil loss and m i ? proving the water?fertilizer utilization ratio ; and the other
12、 is in? creasing SOC conten,t whose main measures contain adjus? ting the far ming system, applying the organi c fertilizers , using the deep?root crops and i ncreasing the content ofm i cro?ag? gregates in soil7.Ami ing at above aspects ,some scholars put forward many manage ment strategies for car
13、bon seques? tration in cropland (Table 1). Severalmanagementmeasures for carbon sequestration in cropland to be extended easily were descri bed in thi s paper .Table 1? Management strategi es to increase SOC content i n crop? landManagement str ategiesFeasi bilityRelative increasing amount of carbon
14、M i nmi um tillage or no?tillageHighMiddle Ground coverHighLow Reducing summer fall owMiddleMiddle RotationMiddleMiddle Impr oving vari eti esHighMiddle Organic fertilizati onMiddleMiddle Irri gati onLowHighData are adapted from Jinet al (2000) i n which a littlemodificati on was made.Management of
15、Land Use Transfor mation Land use transfor mationw ill cause the changes of vege? tations and soil carbon storage ,whi ch makes the manage? ment of land use transfor mation become one of m i portant measures to increase soil carbon sequestrati on .In order to coordinate the relationship between incr
16、easing the potenti al for carbon sequestration in cropl and and leaving enough land are? a to devel op agriculture at regi onal exten,t itneeds to reason? ably plan the distri bution ofdifferent land use patternsand sci ? entifi cally and ri gorously control the land use transfor mati onResources and EnvironmentAgriculturalSci encethe water and soil l oss is the main process to cause the l oss of SOC,and the degraded l and has l ower SOC storage ,then the water and soil l oss can be c
