赤红壤蔗区11年连续增量施磷下磷素演变及其 对甘蔗产量与磷流失的影响

区惠平,周柳强,黄金生,谢如林,朱晓晖,彭嘉宇,曾艳,莫宗标,谭宏伟,叶盛勤

Change of Phosphorus in Lateritic Red Soil and Its Effect on Sugarcane Yield and Phosphorus Loss in Runoff Under 11-Year Continuous Application of Excessive Phosphorus Fertilizer

OU HuiPing,ZHOU LiuQiang,HUANG JinSheng,XIE RuLin,ZHU XiaoHui,PENG JiaYu,ZENG Yan,MO ZongBiao,TAN HongWei,YE ShengQin

表2 施肥处理第11年土壤Olsen-P含量降至环境阈值所需的时间

Table 2 Time need for Olsen-P content in 11-year decrease to environmental threshold

处理 Treatment 每年甘蔗携磷量 P amount in sugarcane (kg P·hm-2) Olsen-P变化量与磷累积盈亏量的响应系数 Coefficient of Olsen-P variation and P balance 第11年土壤 Olsen-P 含量 Olsen-P content in 11-year (mg·kg-1) Olsen-P 环境阈值[13] Environment threshold (mg·kg-1) 不施肥下土壤Olsen-P降至环境阈值的 时间(年) Time need for Olsen-P decrease to environment threshold with no fertilization (a) OPT 18.36 0.1101 45.8 21.7 12 OPT+P 18.92 0.0915 50.0 21.7 16