Potential of Carbon Emission Reduction by Crop-Livestock Integration in Main Producing Areas of Mountain Farm-Produces——Taking Four Counties in Sichuan Province,China as Examples
Crop-livestock integration in agriculture can not only effectively recycled agricultural wastes but has remarkable effects on carbon emission reduction.Previous research on a sustainable green mountain agriculture paid more attentions to the resource utilization of agricultural wastes with pollution control,but hardly concerned about the effect of carbon emission reduction by crop-livestock integration on farm-produces.In this study,the performances of carbon emission reduction by crop-livestock integration in mountain agriculture over past 10 years(2008 to 2017)on a county basis was exemplified by four counties,Hongya,Kaijiang,Yanting and Xingwen,which are main producing regions of mountain farm-produces in Sichuan Basin,China.It used the method of straw-to-grain ratio to estimate the amount of crop straw and further estimated the potential of carbon emission reduction by utilization of straw fodder based on energy conversion;it used the method of excretion coefficient to estimate the amount of livestock manure,and further estimated the potential of carbon emission reduction by utilization of livestock manure in terms of nutrient cycle.(1)In the past 10 years,the potential of annual carbon emission reduction by crop-livestock integration in the four counties was 19.42 × 104 t,with a slight increase of 1.25％,in which straw fodder individually was 15.49 × 104t,an increase of 8.37％;the left livestock manure was 3.93 x 104 t,down 23.09％.(2)The potential of annual carbon emission reduction by crop-livestock integration was 2.04 t/hm2 per unit area of cultivated land for the four counties,in a descending order of Kaijiang(2.36 t/hm2)＞Hongya(2.30 t/hm2)＞Yanting(2.01 t/hm2)＞Xingwen(1.57 t/hm2).(3)The proportion of the straw fodder utilization to the livestock manure utilization in the potential of annual carbon emission reduction by crop-livestock integration was 79.75％to 20.25％in the four regions;among them,straw fodder accounted for 86.27％of the potential,with a descending order of rice at 35.07％,corn at 24.99％,wheat at 13.44％and rapeseed at 12.77％;livestock manure was primarily composed of cattle manure at 52.94％.This study can provide a theoretical basis for guideline of carbon emission reduction by crop-livestock integration in mountain agriculture.
main producing area of farm-producecrop-livestock integrationpotential of carbon emission reductioncrop strawlivestock manure
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