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Authors: 超级管理员 | Edit: xingqiang
Chapter 4 presents a detailed CropWatch analysis for China,focusing on the seven most productive agro-ecological regions of the east and south. After a brief overview including a production outlook for 2014, detailed analysis including maps and profiles for NDVI, VCIx, CALF, and BIOMSS are provided for the individual regions. Additional information on the agroclimatic indicators for agriculturally important Chinese province are provided in table A.11in Annex A.
4.1 Overview
Figures 4.1-4.6 illustrate the distribution and profiles of rainfall(RAIN) and temperature (TEMP) indicators, as well as the fraction of cropped arable land (CALF), maximum Vegetation Condition Index (VCIx), cropping intensity,and minimum Vegetation Health Index (VHIn). Indicator values are provided in table 4.1.
Generally favorable conditions prevailed over the monitoring period with 14% above average RAIN, 0.7°C degree above average TEMP,and average radiation (RADPAR), resulting in a 12% rise over average biomass(BIOMSS). Without exception, TEMP increased in all seven regions in China, with the lowest increase (0.1°C) in the North-east region) and the most significant increase in Southwest China (1.2°C degree). RAIN in Huanghuaihai, Northeast,and Southwest China slightly decreased (6%, 3%, and 3%, respectively). RAIN remained average throughout the year for most regions north of Yangtze River(58% of the country), while it was above average in Guangdong and the east of Guangxi province. Temperature fluctuated widely from January to June; it was below average in mid-February and May and above average in late October.
High VCIx values occurred mostly in Southern China and in the Northeast region. Low VCIx values are mainly located in central and eastern China, particularly in southern Jiangsu and western Henanprovinces. Crop condition in the northeast is above the thirteen-year average(VCIx is 0.92), though agro-climatic conditions are at an average level. At th eregional and provincial scale, BIOMSS is above average, except for the Southwest regions and corresponding provinces.
During the monitoring period the croppedarable land fraction (CALF) did not change; for all seven monitored regions,CALF is about the five-year average; only slightly decreased values are recorded for the Loess and Huanghuaihai regions (-1% and -3%, respectively).Cropping intensity increased by 4% and 5% in the Inner Mongolia and Loess region and is at average levels in the Northeast; it decreased in the other four regions.
Minimum VHI indicates that almost all regions in central and eastern China suffered from water stress, including the east of Sichuan, western and southern Henan, south of Jiangsu, and south of Hubeiprovinces (figure 4.6).
Figure 4.1. China spatial distribution of rainfall profiles, July-October 2014
Table 4.1. CropWatch agroclimaticand agronomic indicators for China, July-October 2014, departure from 5YA and13YA
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| RAIN (%) | TEMP | RADPAR | BIOMSS | CALF | Cropping Intensity (% points) | Maximum VCI | |
Huanghuaihai | -6 | 0.5 | 0 | 8 | -3 | -2 | 0.83 | |
Inner Mongolia | 39 | 0.3 | -1 | 25 | 0 | 4 | 0.79 | |
Loess region | 10 | 0.6 | 0 | 10 | -1 | 5 | 0.81 | |
Lower Yangtze | 28 | 0.5 | -5 | 13 | 0 | -7 | 0.86 | |
North-East | -3 | 0.1 | 3 | -3 | 0 | 0 | 0.92 |
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Southern China | -3 | 1.2 | 1 | 0 | 0 | -13 | 0.87 |
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South West | 21 | 0.8 | -1 | 14 | 0 | -11 |
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