| Spatial\|temporal distribution characteristics of grain yield and its potential productivity in the Jing River Basin and their relationships with MODIS-GPP |
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| DOI：10.7606/j.issn.1000-7601.2020.06.26 |
| Key Words: gross primary productivity （GPP） climatic potential productivity of crop grain yield the Jing River Basin |
| Author Name | Affiliation | | FU Songlin | Institute of Soil and Water Conservation, Northwest A＆F University, Yangling, Shaanxi 712100, China | | KONG Lingying | Institute of Soil and Water Conservation, Northwest A＆F University, Yangling, Shaanxi 712100, China | | ZHOU Haixiang | Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China | | LIU Wenzhao | Institute of Soil and Water Conservation, Northwest A＆F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Based on the data from MOD17A2H GPP, 28 meteorological stations, and agricultural statistical yearbook from 2001 to 2012, and the methods of MK trend testing and regression analysis, etc., this paper analyzed the relationships among the gross primary productivity (GPP), potential productivity and actual grain yield, and their spatial\|temporal distribution characteristics in the Jing Rever Basin. The results showed that: (1) The GPP in the Jing River Basin had an increasing trend with an average value of 519.6 g·m-2·a-1. The spatial pattern of GPP was generally consistent with the distribution of precipitation, and it gradually increased from the northwest to the southeast. The northern part of the basin was a low\|value area of GPP, the mountainous forest lands and river valleys were high\|value areas, and Changwu, Zhengning, Xunyi, and Binxian in the southern part were the secondary high\|value areas. (2) Spatially, the potential productivity of light and temperature was increasing from the west to the east in the Jing River Basin, with a “saddle\|shaped” distribution in the north\|south direction, ranging from 16 462~21 786 kg·hm-2; and the climatic potential productivity was increasing from the northwest to the southeast with a range of 4 945~12 412 kg·hm-2. From 2001 to 2012, there were no significant trends of interannual changes in the two potential productivity. (3) The crop grain yield in the Jing River Basin increased spatially from the northwest to the southeast, and showed an increasing trend during the study period. The differences between crop climatic potential productivity and its grain yield were above 6 000 kg·hm-2 in most areas of the Jing River Basin. (4) The spatial correlation coefficients between the crop grain yield, the climatic potential productivity, and GPP reached very significant level (P＜0.01), respectively; and the temporal correlation coefficient between crop grain yield and GPP reached a significant level (P＜0.05). The very significant correlation between the crop yield and MODIS-GPP demonstrated the availability of estimating grain yield through remote sensing, which is helpful to the prediction of regional grain yield. |
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