摘要
Heterogenous distribution of crops,feed and livestock across China has halted the circulation of nutrients within the agricultural system and is responsible for massive nutrient losses[1,2].Generated livestock manure exceeded optimal crop requirements in 30%and 50%of over 2300 studied counties when there was improved recycling of nitrogen(N)and phosphorus(P)in the food chain,repectively[2].Most of these counties are located in southern and coastal areas,whereas there is a deficit of livestock manure in northern and western China.Such heterogenous distribution of crop-livestock production led to 4.0 Tg manure N and 0.9 Tg manure P[2],which are economically impossible to recycle and will end up in the surrounding environment.In addition,about 40%of feed protein consumed by domestic livestock production relied on importation,putting China’s livestock production supply at high risk in the post pandemic world[3].Hence,China is facing the twin issues of too many manure nutrients but too little feed nutrients simultaneously.
基金
the National Key R&D Program of China(2016YFD0800106)
the National Natural Science Foundation of China(31572210,31872403,71961137011)
Key Research Program of Frontier Sciences-CAS(QYZDY-SSWSMC014)
Key Laboratory of Agricultural Water Resources-CAS(ZD201802)
the Key Research Program-CAS(KFJ-STS-ZDTP-053)
Hebei Dairy Cattle Innovation Team of Modern Agroindustry Technology Research System,China(HBCT2018120206)
the Youth Innovation Promotion Association,CAS(2019101)
Outstanding Young Scientists Project of Natural Science Foundation of Hebei(C2019503054).
