摘要
为减少养猪场废弃物排放和化肥使用,降低环境污染,最大限度将猪粪肥料化,采用盆栽试验方法,在自然降雨条件下模拟研究了亚热带红壤丘陵区花生-萝卜轮作体系下红黏土红壤对猪粪的安全消纳能力。试验设在江西鹰潭中国科学院红壤生态试验站,供试土壤肥力水平中等(有机碳5.16g·kg-1,Olsen-P28.34mg·kg-1)。试验以3组化肥水平为基础(不施化肥,常规化肥减半,常规化肥用量),常规化肥年施肥量为:N100 kg·hm-2,P50kg·hm-2,K100kg·hm-2。每个化肥用量基础上分别设置7个猪粪施肥梯度(以P计):0、25、50、100、200、400、800kgP·hm-2。通过监测两年土壤渗漏水中铵态氮、硝态氮和总磷浓度变化,结合作物产量和土壤养分含量变化,初步确定了花生-萝卜轮作体系下红黏土红壤对猪粪的安全消纳量。结果表明:(1)从地下水和土壤环境角度分析,在不施化肥情况下,猪粪施用量应低于200kgP·hm-2,常用化肥用量减半时,猪粪安全用量为不高于100 kg P·hm-2;常规化肥用量下,即使不施猪粪,渗漏水硝态氮浓度已经有引起污染的风险。(2)从作物产量角度考虑,猪粪和化肥配合施用时猪粪用量超过100 kg P·hm-2时不能使作物显著增产。因此,在保证经济效益和环境生态效益的同时,确定年化肥用量为常规用量减半水平,花生-萝卜轮作体系下红黏土红壤猪粪最大安全消纳量为100kgP·hm-2,相当于每年施用鲜猪粪24000kg·hm-2。
Studying pig manure maximum loading capacity of soil would maximize manure utilization, reduce use of chemical fertilizer and prevent environmental pollution. In this study, maximum loading capacity of red clay soil for pig manure in peanut（Arachis hypogaea L.）-radish（Raphanus sativus L.） system was investigated in a pot experiment under natural rainfall in Ecological Experimental Station of Red Soil, Chinese Academy of Sciences. Three levels of chemical fertilizer treatments（zero, half and full level of chemical fertilizer）were set up in medium fertile red clay soil（soil organic carbon 5.16 g·kg^-1,Olsen-P 28.34 mg·kg^-1）. The full level of chemical fertilizer was 100kg·hm^-2 of nitrogen, 50 kg·hm^-2of phosphorus and 100 kg·hm^-2 of potassium. The chemical fertilizer was treated every year. Seven pig manure rates（0, 25, 50, 100, 200, 400, 800 kg P·hm^-2）were added to each chemical fertilizer treatment. Ammonium-N, nitrate-N and total phosphorus in leaching water, crop production and accumulation of nutrients in the soil were monitored. From the point of view of water and soil environment quality, the maximum safe application rate of pig manure should be less than 200 kg P·hm^-2 for the treatment without chemical fertilizer, and 100 kg P·hm^-2 for the treatment with half level of chemical fertilizer. However, there was risk of nitrate pollution in the treatment with full level of chemical fertilizer, even without pig manure added. Crop yields were not enhanced by applying pig manure at rates of more than 100 kg P·hm^-2 together with chemical fertilizer. The present research indicates that under applying pig manure at 100 kg P·hm^-2 or 24 000 kg·hm^-2 manure would cut chemical fertilizers by half without reducing economic interests and environmental quality.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2014年第9期1828-1836,共9页
Journal of Agro-Environment Science
基金
公益性行业(农业)科研专项(201203050)
中科院院地合作和江西省赣鄱英才项目
关键词
红壤
花生
猪粪
消纳量
red clay soil
peanut
pig manure
maximum loading capacity
