Quantitative monitoring of grazing intensity in the temperate meadow steppe based on remote sensing data
Quantitative monitoring of grazing intensity in the temperate meadow steppe based on remote sensing data
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基于遥感数据的温带草甸草原放牧强度定量监测
DOI：
10.1080/01431161.2018.1500733
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发表时间：
2018-08
影响因子：
3.4
通讯作者：
Xiaoping Xin
中科院分区：
文献类型：
--
作者：
Dawei Xu;Baorui Chen;Ruirui Yan;Yuchun Yan;Xinbo Sun;Lijun Xu;Xiaoping Xin
ABSTRACT Grazing intensity (GI) is difficult to measure accurately because of the diversity of grazing livestock, their mobility in the grazing space and the uncertainty of grazing times. Thus, GI monitoring is often only qualitative, while quantitative monitoring is scarce. In this study, models correlating GI, the normalized difference vegetation index (NDVI) and aboveground biomass (AGB) were established based on a controlled GI experiment. The GI derived from NDVI was evaluated using the GI derived from AGB samples, under the principle that AGB is similar for the same GI in the same grassland type. The results showed that the appropriate time to build the model in the study area was from July to August, when there was a negative correlation between GI and NDVI. The simulated GI derived from NDVI was similar to GI derived from AGB, and the R2 (coefficient of determination) values for fresh weight and dry weight were 0.3770 and 0.4292, respectively; the root mean square error (RMSE) were 0.2302 and 0.1953 animal units (AU) ha−1 (1 AU = 500 kg of adult cattle); and the relative error from −20% to 20% accounted for 62.07% and 72.41% of the total samples. Most of the study area was under heavy grazing according to monitoring results from 2010 to 2016, except for a few pastures with rational utilization (0.23 AU ha−1 – 0.46 AU ha−1), and continuous heavy grazing often occurred for many years without rest grazing.
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DOI：
10.1016/j.rama.2014.12.001
发表时间：
2014-09
期刊：
--
影响因子：
--
作者：
R. Yan;X. Xin;Yuchun Yan;Xu Wang;B. Zhang;Guixia Yang;Shimin Liu;Yu Deng;Linghao Li
通讯作者：
R. Yan;X. Xin;Yuchun Yan;Xu Wang;B. Zhang;Guixia Yang;Shimin Liu;Yu Deng;Linghao Li
影响因子：
6.1
作者：
I. Odriozola;G. García-Baquero;N. A. Laskurain;A. Aldezabal
通讯作者：
I. Odriozola;G. García-Baquero;N. A. Laskurain;A. Aldezabal
影响因子：
6.6
作者：
Kawamura, K;Akiyama, T;Wang, SP
通讯作者：
Wang, SP
影响因子：
13.5
作者：
M. Villarreal;L. Norman;Steve Buckley;C. Wallace;Michelle A. Coe
通讯作者：
M. Villarreal;L. Norman;Steve Buckley;C. Wallace;Michelle A. Coe
影响因子：
13.5
作者：
Izaya Numata;D. Roberts;O. Chadwick;J. Schimel;F. A. A. Sampaio-F.-A.-A.-Sampaio-15545438;Francisco das Chagas Leonidas;J. V. Soares
通讯作者：
Izaya Numata;D. Roberts;O. Chadwick;J. Schimel;F. A. A. Sampaio-F.-A.-A.-Sampaio-15545438;Francisco das Chagas Leonidas;J. V. Soares