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4 地下孔（裂）隙度下地表、地下径流养分流失状况

Table 4 Nutrient loss of surface and underground runoff under different underground fissure porosity

养分 Nutrient	孔(裂)隙度 Fissure porosity (%)	地表径流Surface runoff			地下径流Underground runoff			地下流失比 Underground loss ratio (%)
养分 Nutrient	孔(裂)隙度 Fissure porosity (%)	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	1	2.51b	276.06a	95.27	1.69	92.23c	31.83	25.04
	3	3.18a	272.52a	94.05	2.55	157.82b	54.46	36.67
	5	2.47c	129.51b	44.69	2.18	293.77a	101.38	69.40
全磷 TP	1	0.23a	23.75a	8.20	0.14	7.46c	2.57	23.90
	3	0.24a	20.76a	7.16	0.19	11.50b	3.97	35.64
	5	0.19b	9.91b	3.42	0.25	32.11a	11.08	76.42
全钾 TK	1	0.43c	47.58a	16.42	0.23	12.99c	4.48	21.44
	3	0.58b	45.69a	15.77	0.34	20.97b	7.24	31.46
	5	0.63a	32.86b	11.34	0.37	48.84a	16.85	59.78