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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。
Using artificial thin layer soil as growth substrate and Bachmann grass as model plant, the effects of different active nutrient concentrations on the germination rate, morphological characteristics and biomass of seedlings of Bachin Grass were studied through outdoor simulation experiments And Bax hippophae rhamnoides, the physiological and biochemical response characteristics of Baxi grass to the initial soil nutrient concentration were discussed. In order to ensure the stability of Bax hippophae plantation in ecological engineering, Engineering reconstruction to provide the basis for nutrient design. The results showed that the germination rate of each treatment group was significantly different (P <0.01), the active nutrient concentration was negatively correlated with the germination rate. With the increase of active nutrient concentration, the germination rate of hippophae rhamnoides decreased, and the high concentration of active nutrient concentration could inhibit the germination of hippophae rhamnoides. The active nutrient concentration gradient had an impact on the plant height, with significant differences among the treatment groups (P <0.01). The average plant height of C6 (150%) was 23.20 cm at the 300th day of experiment. The average height of CK (0%) was 16.30 cm. On the 300th day of experiment, the average biomass of C6 was the largest, the average biomass of CK was the smallest, and there was significant difference among the treatments (P <0.01). The high concentration of available nutrients had no significant effect on plant biomass accumulation. Nutrient use efficiency of N, P and K elements showed a decreasing trend with the increase of active nutrient content, that is, N, P, K nutrient utilization efficiency was significantly negatively correlated with active nutrient content. In conclusion, the biomass of C6 treatment group is the highest, and its nutrient utilization efficiency is high, which is in line with the requirements of ecological reconstruction project. Therefore, it is suggested that when C6H is the best active nutrient concentration for soil and water conservation and ecological engineering plantation, Happy grass stable construction.