摘要
采用样方调查和随机采样相结合的方法,对衡阳紫色土丘陵坡地6种微地形(包括:原状坡(CK)、浅沟(Ⅰ)、切沟(Ⅱ)、塌陷(Ⅲ)、缓台(Ⅳ)和陡坎(Ⅴ))的土壤水分及地上生物量进行调查和研究.结果表明:(1)6种微地形两两配对的Wilcoxon秩检验,CK~Ⅰ(0.110)、Ⅱ~Ⅲ(0.109)、Ⅱ~Ⅳ(0.973)和Ⅳ~Ⅴ(0.339)的相关性不显著外(P〉0.05),其余两两配对的相关性达到显著或极显著正相关(P〈0.05或P〈0.01);(2)6种微地形中,从土层(0~20 cm)→土层(20~40 cm)→土层(40~60 cm),土壤含水量显著减小(P〈0.05).0~60 cm土层,各微地形土壤含水量的大小顺序为:Ⅲ(13.32%)〉Ⅳ(12.28%)〉Ⅰ(10.30%)〉Ⅱ(12.03%)〉CK(9.53%)〉Ⅴ(8.22%)(P〈0.05);(3)6种微地形中,从土层(0~20 cm)→土层(20~40 cm)→土层(40~60 cm),土壤水分的变异系数显著减小(P〈0.05).0~60 cm土层,各微地形土壤水分变异系数的大小顺序为:Ⅴ(26.0%)〉Ⅳ(25.9%)〉CK(24.9%)〉Ⅱ(20.7%)〉Ⅲ(18.0%)〉Ⅰ(15.1%)(P〈0.05);(4)不同微地形的生物量的大小顺序为:Ⅲ(263.82 g/m2)〉Ⅱ(254.29 g/m2)〉Ⅰ(238.67 g/m2)〉CK(193.61 g/m2)〉Ⅳ(154.86 g/m2)〉Ⅴ(122.35 g/m2)(P〈0.05),微地形生物量与0~60 cm土壤水分的变异系数呈负相关(y=-0.006x+35.30,**R2=0.690).研究结果表明:在衡阳紫色土丘陵坡进行植被恢复时,在按传统立地类型划分原则的基础上,还应按微地形的水分特征有区别地配置植被恢复模式.图1,表4,参24.
By taking the studied the soil moisture and methods of sampling , investigation and randomized sampling, the author biomass of six types of microrelief in hilly slopeland with purple soils in Hengyang (including original slope(CK) , shallow gully( I ), gully( Ⅱ ) , collaps( m ) , plateform( 1V ) and scarp( V ) ). The results showed that: (1)Except for CK - I (0. 110), Ⅱ N 111 (0.109), Ⅱ - IV (0.973) and IV - V (0.339) (P 〉0.05), there existed significant relevance or even more between the other two couple rank sum test(P 〈0.05 or P 〈0.01 ) (2) In the 6 types of microrelief, from soil layer (0 -20 cm) , soil layer (20 -40 cm) to soil layer(40 -60 cm) , the soil moisture decreased greatly( P 〈 0.05 ). In the soil layer(0 ~ 60 era), the water moisture were followed the order as m ( 13.32% ) 〉 IV (12.28%) 〉 I (10.30%) 〉 11 (12.03%) 〉CK(9.53%) 〉 V (8.22%) (P 〈0.05) ; (3)From soil layer(0 -20 cm), soil layer (20 -40 cm) to soil layer(40 -60 cm), the soil moisture variation coeffi- cient significantly decreased (P 〈 0.05 ). In the soil layer(0 -60 era), the soil moisture variation coeffi- cient were followed the order asV (26.0%) 〉 IV(25.9%) 〉 CK(24.9%) 〉 II (20.7%) 〉 HI ( 18.0% ) 〉 I ( 15.1% ) ( P 〈 0.05 ) ; (4) The biomass in the 6 types of microrelief were followed the order as 111 ( 263.82 g/m2 ) 〉 II ( 254.29 g/m2 ) 〉 I ( 238.67 g/m2 ) 〉 CK ( 193.61 g/m2 ) 〉 IV (154. 86 g/m2) 〉 V (122.35 g/m2) (P 〈0.05). There existed negative relevance between biomass and soil moisture of 0 - 60 cm soil layer ( y = - 0. 006x + 35.30, * * R2 = 0. 690). Therefore, in the re-vege- tation of slopeland with purple soils in Hengyang, we should configure re-vegetation models discriminately based on re-vegetation units determined by traditional principles as well as the characteristics of the soil moisture, lfig. , 4 tabs. , 24refs.
出处
《湖南生态科学学报》
CAS
2014年第4期16-21,共6页
Journal of Hunan Ecological Science
基金
国家科技支撑计划项目(编号:2012BAD14B17)
关键词
微地形
土壤水分
生物量
紫色土
衡阳
microrelief
soil moisture
biomass
purple soils
Hengyang