雨强和地下孔（裂）隙度对喀斯特坡耕地养分流失的影响

姚一文,戴全厚,甘艺贤,高儒学,严友进,王玉红

Effects of Rainfall Intensity and Underground Hole (Fracture) Gap on Nutrient Loss in Karst Sloping Farmland

YAO YiWen,DAI QuanHou,GAN YiXian,GAO RuXue,YAN YouJin,WANG YuHong

表3 不同雨强下地表、地下径流养分流失状况

Table 3 Nutrient loss of surface and underground runoff under different rainfall intensity

养分 Nutrient	降雨强度 Rainfall intensity (mm·h^-1)	地表径流Surface runoff			地下径流Underground runoff			地下流失比 Underground loss ratio (%)
养分 Nutrient	降雨强度 Rainfall intensity (mm·h^-1)	平均流失浓度 Average loss concentration (mg·L^-1)	流失量 Total loss (mg)	养分流失模数 Nutrient loss modulus (mg·m^-2·h^-1)	平均流失浓度 Average loss concentration (mg·L^-1)	流失量 Total loss (mg)	养分流失模数 Nutrient loss modulus (mg·m^-2·h^-1)	地下流失比 Underground loss ratio (%)
全氮 TN	30	0	0	0	2.00	55.98c	19.32	100.00
	50	2.76	160.44c	55.37	1.98	71.84b	24.79	30.93
	70	2.51	219.18b	75.64	2.01	92.23a	31.83	29.62
	90	2.51	276.06a	95.27	1.69	97.24a	33.56	26.05
全磷 TP	30	0	0	0	0.11	2.56c	0.88	100.00
	50	0.39	14.90b	5.14	0.21	7.88b	2.72	34.59
	70	0.20	23.30a	8.04	0.19	9.03a	3.12	27.93
	90	0.23	23.75a	8.20	0.14	7.46b	2.57	23.90
全钾 TK	30	0	0	0	0.22	5.28d	1.82	100.00
	50	0.44	26.12c	9.01	0.21	7.19c	2.48	21.59
	70	0.43	35.59b	12.28	0.23	11.47b	3.96	24.37
	90	0.41	47.58a	16.42	0.23	12.99a	4.48	21.45