摘要
为探讨生物质土壤改良剂作为沙质土壤改良剂对风沙土的改良效果,通过室外蒸发试验比较了生物质土壤改良剂和羊粪2种改良介质的不同施用率(0%,10%,20%,30%,40%,50%)对风沙土物理性状及蒸发特性的影响。结果表明:与CK相比,随着生物质改良剂追施比例的增大,土壤容重降低幅度为3.76%～42.11%,孔隙度、孔隙比增加幅度分别为8.52%～54.09%和15.55%～151.13%,饱和含水量最大增幅达到157.44%,是对照的2.57倍;经方差分析证明,G2、G3、G4、G5处理的土壤容重,G3、G4、G5处理的土壤孔隙度及饱和含水量,与CK相比,均达差异极显著水平(P<0.01);各时段内累积蒸发率快慢呈CK>G1>G2>G3>G4>G5,即随着改良剂添加比例的增大而递减。与同比例下的羊粪相比,经过生物质改良剂作用后的土壤容重明显降低,孔隙度及饱和含水量明显升高;各蒸发时段内累积蒸发率表现为:G1<Y1、G2<Y2、G3<Y3、G4<Y4、G5<Y5。综合分析认为,生物质土壤改良剂能够有效地改善风沙土的物理性状,降低蒸发速率,增强沙土的保水能力;此外,在土壤各物理性状的改良效果上,生物质土壤改良剂的最佳配比在30%左右。
To find out improvement effects of aeolian sandy soil with biomass soil conditioner, the effects of biomass soil conditioner and sheep manure at different application rates （0%, 10%, 20%, 30%, 40%, 50% ） have been compared on physical characters and evaporation properties of aeolian sandy soil by means of outdoor evaporation experiment. The results show that compared with CK, with the increase of topdressing rate of biomass conditioner, soil bulk density has decreased by 3.76% - 42. 11%, porosity and void ratio have increased by 8.52% ～ 54. 09% and 15.55% ～ 151.13% separately, the maximum increase of saturated water content is 157.44% with 2.57 times of CK. Through variance analysis, compared with CK, soil bulk density of G2, G3, G4, G5 and soil porosity and saturated water content of G3, G4, G5 have respectively reached extremely significant difference level （ P 〈 0.01 ）. The cumulative evaporation rates of each period follow the order of CK 〉 G1 〉 G2 〉 G3 〉 G4 〉 GS, di- minishing with the conditioner application rates. Compared with sheep manure at same proportion, soil bulk density mixed with biomass improver is signifi And the cumulative rate of evaporation cantly lower, porosity and saturated water content are significantly higher. of each period is G1 〈 Y1, G2 〈 Y2 , G3 〈 Y3, G4 〈 Y4, G5 〈 Y5. It might be concluded that biomass soil conditioner can effectively improve soil physical characters, reduce evaporation rate and enhance water retention capacity. In addition, judging from improvement of physical properties of aeolian sandy soil, the best ratio of biomass soil conditioner is about 30%.
出处
《内蒙古林业科技》
2013年第2期1-6,共6页
Journal of Inner Mongolia Forestry Science and Technology
基金
国家林业局"948"项目"沙地贫瘠土壤地力保育技术引进"(编号:2009-4-34)资助
关键词
土壤改良剂
风沙土物理性状
土壤蒸发
soil conditioner
physical characters of aeolian sandy soil
soil evaporation
