农田碳汇管理策略及其效果评价(英文)

sequestra tion in crop l and and m iti ga te the m i pacts from cli [ 6] m ate change in Ch i na . Increas i ng the carbon sto rage o f agro ecosyste m is gen e ra ll y taken m easu res from two aspects : One is reduc i ng the carbon l oss , whose ma in m easu res conta i n m i prov i ng the en e rgy u tiliza tion ra ti o , reduc i ng the wa ter and so il loss and m i p roving the wa te r fe rtilizer utilization ra tio ; and the othe r is in creasing SOC con ten,t who se ma in measures contain ad jus ting the fa r m ing system, app lying the organ i c fertilizers , using the deep roo t crops and i ncreasing the con tent o f m i c ro ag [ 7] g rega tes in so il . A m i ing a t above aspects , some scho lars pu t forwa rd many manage m en t strateg ies for ca rbon seques tra tion in crop land ( Tab le 1). Severa lm anagementm easu res for carbon sequestra tion in crop land to be extended easily were descri bed in th i s pape r .
1, 3
4
1
1. Institute ofG eographic Sc i e nces and Natural Resources Research , Chinese Academ y of Sciences ( CAS), Be ijing 100101; 2. Center for Chinese Agricultural Poli cy , CAS , Be ijing 100101 ; 3. G raduate Univers ity ofCAS, Beiji n g 100049; 4 . State Key Laboratory ofW aterEnv iron ment Sm i ulati on , College of Resources Sc ience& Technol o gy , Beijing Nor mal U ni vers ity , Be ijing 100875 Abstract In or der to dea lw ith the globa l change and to reduce em iss i o n of greenhouse gas , a number of countri e s have s tr engthened studies on carbon sequestration in crop l and. Carbon seques tration in c ropland is not only an m i portant component for the global carbon stock , but also is the mos t acti ve part to sequestrate the carbon in soil from atmosphere . In this sense, it is ofnecessity and s i g nifi cance to strengthen the study onmanagemento f carbon sequestration in c ropland . Based on the main factors affec ting car bon cyc l e in agro ecosystem s , this paper summari zes the r el e vant managementmeasures to s trengthen the capac ity of reduc ing em ission of car bon and increasing the carbon sequestration in cr opl a nd , and evaluates the effects of these measures after being m i pl emented at a regiona l ex ten. t Key w o rds Carbon sequestration ; Car bon sequestration in crop l a nd ; Soil or ganic carbon ; Management of carbon sequestration ; Reduc ing car bon em iss ion ; Increasing carbon sequestration
Received: July 10, 2009 A ccepted: A ugust 25, 2009 Supported by Nati o nal Natur a l Sc ience Foundati on of Chi na ( 70873118); the Chinese Academy of Sc i e nces ( kzcx2 y w 305 2); the national key sc i e ntific and technol o gi cal project ( 2006BAC08B03 , 2006BAC08B06, 2008BAC43B01). * C orresponding author . E mai:l dengxz . ccap@ i g snrr . ac . cn
Managem ent Strateg ies and Their Evaluation for Carbon Sequestration in Crop land
DENG X iang zheFra bibliotekg1, 2*
, HAN Jian zhi , ZHAN J in yan , ZHAO Yong hong
Agricultural Sc i ence& Technology , 2009 , 10( 5): 134- 139 Copyright 2009, Infor mation Ins titute of HAAS. A ll rights r eserved.
Resources and Environment
W ith the more and mo re in depth resea rches on g loba l environ ment change , the management stra tegies for carbon sequestra tion in crop l and have been w i de ly g iven a tten tion . Current researches show tha t the m issing o f ca rbon most [ 1- 2] p robab l y exists i n the terrestr i a l ecosyste m . A lthough the re are many lite ra ture s focus on the ca rbon sequestra ti on o f te rrestria l ecosystem in China[ 3- 4] , researches on carbon cycle in crop land a re re la tive ly few. The managemen t meas ures fo r ca rbon sequestra ti on i n crop l and a ffect the dyna mi c changes o f soil organ ic carbon ( SOC) to a g rea te r exten.t The excess i ve recla ma ti on and m i proper manage men t w ill g reatly reduce the SOC amount o f crop l and so as to cause the massive em issi on o fCO2. O p tm i iza tion of ag ricu ltura l management measures can no t on l y i ncrease the so il ca rbon sequestra ti on , m i prove the so il qua lity and enhance the ag ricu ltura l p roducti v ity , but a lso reduce the so il and wa te r l oss , p ro tect the b i o tope landscape , e tc . It shou l d be noticed that the po ten tia l o f carbon seques tration in the top so il is no t on l y in fluenced by the vege ta ti on cond ition , env iron m en ta l tempe ra ture , the co mpositi ons o f so il m i nera,l wea thered l aye r depth , so il dra i nage , the ava ila b ility o f wa te r and a ir , etc . , but a lso is con tro ll ed by the chem ica l compos iti on o f so il o rgan ic matte rs and the ir resist [ 5] ance to the m icrob ia l deg rada tion . W hen po tentia l o f carbon sequestra tion in top so il is ca lcu lated , the em ission o f CO2 shou l d be consi dered due to consum ing fossil energy in the p rocess o f fer tilizer production , wa te r dive rsion irr i ga tion , agr i cultura l mach i nery wo rk , e tc . The re fore , more and more re sea rch e fforts shou l d be made to exp lore the sequestra ti on mechan is m and po ten tia l o f SOC con ten t in the top so i,l and to formu l a te the op tm i a l agr i c ultura l management measures unde r loca l cond itions so as to m i prove the po tenti a l o f carbon