百喜草对人工土壤活性养分浓度的生理生态响应  

Physiological and Ecological Responses of Paspalum notatum Flugge to the Artificial Soil Active Nutrient Concentration

作　　者：郑晟 陈静[2] 吴邦志 陈璋[4] 

机构地区：[1]黔西国有林场,贵州黔西551500 [2]山西大学法学院,山西太原030006 [3]四川省沃尔宜环保科技有限公司,四川成都610064 [4]山西大学黄土高原研究所,山西太原030006

出　　处：《北方园艺》2015年第14期56-62,共7页Northern Horticulture

基　　金：国家科技支撑计划资助项目(2011BAK12B04)

摘　　要：以人工薄层土壤作为生长基质,以百喜草为模式植物,通过室外模拟试验,研究了土壤不同活性养分浓度对百喜草的萌发率、形态特征、生物量等幼苗生长发育特征的影响规律及百喜草的养分利用效率变化特征,探讨了百喜草对土壤初始养分浓度的生理生化响应特征,以期为保障生态工程中百喜草植被系统的稳定建植,为应用百喜草在生态工程重建中养分设计提供依据。结果表明:各处理组萌发率差异显著(P<0.01),活性养分浓度与萌发率负相关。随着活性养分浓度的增加,百喜草的萌发率降低,高浓度的活性养分浓度对百喜草萌发有抑制作用。活性养分浓度梯度对株高有影响,各处理组之间差异显著(P<0.01)。试验第300天,C6(150%)平均株高最大,为23.20cm,CK(0%)平均株高最小,为16.30cm。试验第300天,C6组的平均生物量最大,CK组平均生物量最小,各处理组存在显著差异(P<0.01),高浓度的有效养分对植物生物量积累没有显著作用。N、P、K各元素的养分利用效率随着活性养分含量增大,呈递减趋势,即N、P、K养分利用效率与活性养分含量呈显著的负相关。综上,C6处理组生物量最大,养分利用效率较高,符合生态重建工程要求,因此建议以百喜草开展水土保持和生态工程植物修复时,C6组为最佳活性养分浓度,有利于百喜草稳定建植。Paspalum notatum Flugge was an important plant for the soil and water conservation and ecosystem reconstruction,and nutrients were important limiting factor for vegetation restoration of the damaged habitats.In order to ensuring the stability vegetation restoration of ecological engineering,the effect of different active nutrient concentrations on the germination rate,morphological characteristics,biomass and other seedling growth characteristics of Paspalum notatum Flugge by the outdoor simulation experiment were studied,as well as the characteristics of nutrient use efficiency.This provided the basis for design nutrients in ecological engineering.The results showed that the differences of germination rates between the treatment groups were significant（P〈0.01）,and a significant negative correlation between the germination rates and the active nutrient concentrations was found.The germination rates showed a decrease with the increasing nutrient concentrations.The high concentration of active nutrients inhibited the germination of Paspalum notatum Flugge.The active nutrient had an influence on plant height,and the difference between the treatment groups were significantly（P〈0.01）.The average height of group C6（150%）was 23.20 cm which was the maximum,the average height of group CK（0%）was 16.30 cm which was the smallest at 300 days.The average biomass of group C6 was maximum,the average biomass of group CK was the smallest at 300 days.There were significant differences between the treatment group（P〈0.01）.The high concentrations of active nutrients had no significant effect on plant biomass accumulation.The nutrient use efficiency trends of N,P and K were that the nutrient use efficiency had deceased with the increasing active nutrient concentrations,there was a significant negative correlation between the nutrient use efficiency and activity nutrient content.All in all,the biomass of group C6 was the maximum,and the nutrient use efficiency was higher,which meet the requirements of ecologica

关 键 词：百喜草 活性养分 水土保持 养分利用效率 

分 类 号：S681.9[农业科学—观赏园艺]