Spa tio2tem pora l d istr ibution of m ultiple cropp ing system s in the Poyang Lake reg ion

Transcription

1 ACTA ECOLOGICA SIN ICA Vol. 28, No. 9 Sep., , 1, 2, 1 (1., Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH 03824, USA) :,,,,, MOD IS, 500m 8d MOD IS/EV I,,,, : ; ; ; ; : (2008) : Q149, S127, S181 : A Spa tio2tem pora l d istr ibution of m ultiple cropp ing system s in the Poyang Lake reg ion YAN Hui2M in 1, HUANG He2Q ing 1, X IAO Xiang2M ing 2, J IANG Lu2Guang 1 1 Institute of Geographic Sciences and N atural Resources Research, Chinese Academ y of Sciences, B eijing, , China 2 Institute for the S tudy of Earth, Oceans and Space, University of N ew Ham pshire, D urham, NH 03824, USA A cta Ecologica S in ica, 2008, 28 (9) : Abstract: Agricultural land use and management is one of the most direct means by which humans impact the earth system, with significant negative environmental effects at local to global scales due to altered ecosystem p rocesses, patterns and resource use. Multip le cropp ing is of particular interest because agricultural intensification has increased p ressure on water resources, ecosystem s, and biodiversity due to increased water withdrawals for irrigation and higher energy inputs due to mechanization and the p roduction of chem ical fertilizer. The Poyang Lake region is one of the most intensified agricultural regions in southern China, and the spatial and temporal pattern of cropp ing system s is determ ined not only by climate and water availability. Population p ressure, social and econom ic conditions and policies, flood risks, and individual farmers : ( ) ; ( 2006BAC08B06) ; ( ) ; NASA : ; : : (1974 ),,,,. E2mail: yanhm@ igsnrr. ac. cn 3 Corresponding author. E2mail: yanhm@ igsnrr. ac. cn Founda tion item : The p roject was financially supported by National Natural Science Foundation of China (No ) ; National Key Project of Scientific and Technical Supporting Program s (No. 2006BAC08B06) ; Chinese Academy of Sciences Hundred Talents Project ( Huang HeQ ing) ; NASA Landuse and Land Cover Change Program and Interdiscip linary Science Program Rece ived date: ; Accepted da te: B iography: YAN Hui2M in, Ph. D., mainly engaged in land use change and ecosystem productivity. E2mail: yanhm@ igsnrr. ac. cn http: / /www. ecolog ica. cn

2 management decisions also have p rofound impacts. is quite comp lex. Therefore, the spatial pattern and temporal p rocess of multip le cropp ing In this paper, we combined agro2meteorological observation data and MOD IS data with a resolution of 500m at 82day intervals to exp lore a novel and robust method to exam ine spatial and temporal dynam ics of multip le cropp ing and crop calendar using a MOD IS/EV I time series curve. this data is potentially app licable for monitoring agricultural intensification. The results indicate that a cropp ing intensity algorithm based on Spatial and temporal variability of multip le cropp ing may be the result of farmers dynam ic adap tation to local climate, socio2econom ic conditions, and food security. An exp licit spatial and temporal analysis of the comp lex dynam ics of multip le cropp ing in the context of coup led human and natural system s is necessary for modeling and evaluating the impacts of human activity on global environmental change and food security. Key W ords: land use; multip le cropp ing; remote sensing; spatio2temporal analysis; poyang Lake [ 1 3 ], [ 4 6 ], [ 7, 8 ],, [ 9 11 ], ( ) [ ], 3,,, 86%,,, [ 15, 16 ],,, [ ],,,,,, [ 22, 23 ] m MOD IS, [ 24, 25 ], MOD IS, ,, 2002.

3 9 : 9154,,, ( ), ; ( ), 1200km,,,, MOD IS MOD IS (MODerate2resolution Imaging Spectroradiometer) NASA EOS 2000 ( http: / /daac. gsfc. nasa. gov) MOD IS, 8d 500m (MOD09A1) ( 1 ) ( EV I, enhanced vegetation index) [ 26 ], 46 MOD IS/EV I, : EV I = G ( nir - red ) / ( nir + (C 1 red - C 2 blue ) +L ) (1), G = 2. 5, C 1 = 6, C 2 = 7. 5, L = 1, n ir, red blue , EV I, EV I ( ),, 500m,, 500m 500m, ( ), : (1), (2), TM, 14,,,, 1. 3 EV I 2 2,,, 3, [ 22 ],,, HANTS( harmonic analysis of time series) [ 27 ] [ 22, 23 ], AVHRR [ 22 ],,,, 2006.

4 ,,,,, : (1) EV I ; (2) HANTS, ; (3), ; EV I EV I EV I NLCD m, 80% EV I, EV I ( 1), EV I 1 EV I EV I EV I ; 2 EV I EV I ; EV I,, ( 1) 2 2 EV I 3, 2 3 ; 3,, 3 ( 2 2 ) 20d, 20d,,, 15 40d, 4, 7,,,, 500m, Fig. 1 MOD IS/EV I 1 Key crop phenological stages and MOD IS/EV I time series curve at Yugan and Q ingjiang stations 2. 2 (28 36 N, E) , 6, 7 ( 2), +

5 9 : 1254, 1 (, ), 2 1, ( ) 7, + +, EV I ( 3A),,,, ( 3B ), 1 10,, Fig Temperature and p recip itation in Nanchang meteorological station in 2002, 2 3,,, 1, (5 10 ) (4 8 ) 1 Fig. 3 (A) (B) 3 Temporal relationship of multip le cropp ing p rogress with p recip itation (A) and temperature (B) time series 2. 3, ( 5),, 30m TM 500m 500m, 500m 500m 80%,, 60% 70%, 50% 80%, 40% 90%,,,, 4 2,,,, 4,,,

6 m 8d MOD IS, ( ), 500m 8d MOD IS/ EV I,, 2 2 2,,,,,,, 1998,,,, 2, 2 2,, 4 Fig. 4 Spatial pattern of multip le cropp ing around Poyang Lake, MOD IS,,, 500m MOD IS,, EV I,,,,, MOD IS a, ; References: [ 1 ] Feddema J J, O leson K W, Bonan G B, et al. The importance of land2cover change in simulating future climates. Science, 2005, 310:

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