%0 Journal Article
%T Effects of long-term application of organic fertilizer and superphosphate on accumulation and leaching of Olsen-P in Fluvo-aquic soil<br>长期施用有机肥和过磷酸钙对潮土有效磷积累与淋溶的影响
%A HUANG Shao-min
%A GUO Dou-dou
%A ZHANG Shui-qing
%A <br>黄绍敏
%A 郭斗斗
%A 张水清
%J 应用生态学报
%D 2011
%I 
%X Based on a 20-year experiment of fertilization with organic and chemical fertilizers on a Fluvo-aquic soil under wheat-corn cropping system, this paper studied the relationships between Olsen-P concentration in plough layer and crop yields as well as the accumulation and vertical translocation of Olsen-P in soil profile. The results showed that when the Olsen-P concentration in plough layer maintained at 10-40 mg·kg-1, the grain yields of wheat and corn were higher, whereas when the concentration of Olsen-P in plough layer was higher than 40 mg·kg-1, it started to leach, which meant that in light loam Fluvo-aquic soil, the threshold value for P leaching might be 40 mg·kg-1. In the treatments of chemical fertilization (NPK) and corn straw returning (SNPK) with the P application rate of  77-90 kg·hm-2, the Olsen-P concentration in plough layer was increased by 0.63-0.72 mg·kg-1 per 100 kg·hm-2 of applied P, with an annual increment of 0.49-0.65 mg·kg-1 and needed 45-60 years for reaching the threshold value for P leaching. In the treatments of chemical fertilization combined with manure application (MNPK, MNPK2, and 1.5MNPK),  the formula of Olsen-P accumulation in 0-20 cm soil layer were YMNPK=3.1097x+6.9615 (R2=0.8562), YMNPK2=2.4765x+13.563(R2=0.9307), and Y1.5MNPK=4.506x+6.4464 (R2=0.8862). It might take 8 years to reach the threshold value for Olsen-P leaching when the P application rate in treatment 1.5MNPK was 210 kg·hm-2, 11 years when the P application rate in treatments MNPK2 and MNPK was 125 and 140 kg·hm-2. Organic fertilization combined with chemical fertilization increased the Olsen-P accumulation rate being 2.5 times higher than chemical fertilization. Excessive application of organic fertilizer could increase the accumulation and leaching of Olsen-P in soil profile.
%K Fluvo-aquic soil
%K long-term experiment
%K Olsen-P
%K accumulation and leaching
%K organic fertilizer<br>潮土
%K 长期定位试验
%K Olsen-P
%K 积累与淋溶
%K 有机肥
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=09D4A79488FD8C180CBDEFAC4A6DE4D7&yid=9377ED8094509821&vid=BC12EA701C895178&iid=CA4FD0336C81A37A&sid=39EEF47180459690&eid=10F298ED9F164662&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=27