黄土高原不同种植年限苜蓿草地土壤与植物化学计量特征
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摘要
为探讨植被种植过程中土壤–植被生态系统养分动态变化规律,本研究以黄土高原多年生紫花苜蓿(Medicago sativa)为研究对象,分析了不同生长年限(种植1、10、20和30年)苜蓿草地土壤与植物养分含量变化及生态化学计量学特征。结果显示,1)土壤有机C和全N含量随种植年限的增加呈先增大后减小的趋势;在0–200 cm土层中,土壤C和N的垂直分布具有一致性,含量随着土层的加深而逐渐减少,并在30 cm以下基本保持稳定;土壤P的含量随着土层的加深基本保持稳定;土壤C∶N,C∶P和N∶P均随苜蓿种植年限的增长呈先增加后减少的趋势,种植10年达到最大值。2)苜蓿叶片C、N、P含量的变化规律与土壤养分变化规律相似,种植10年达到最大值;叶片C∶N、C∶P、N∶P随种植年限的增加均先下降后回升。3)土壤化学计量特征与植物化学计量特征无显著相关关系(P> 0.05)。研究结果表明,当苜蓿种植到10年之后,应采取一定的管理措施来改善土壤质量以保证苜蓿正常生长。
To investigate the changes inw nutrients in soil-vegetation ecosystems, Medicago sativa at different ages(1, 10,20, 30 years) was selected to analyze variations in the nutrient content and characteristics of eco-chemical stoichiometry. The results showed that: 1) the content of soil organic carbon(SOC) and total nitrogen(TN) first increased and then decreased as age increased, the vertical distribution of SOC and TN at a soil depth of 0–200 cm was consistent at all alfalfa grasslands, and the content of SOC and TN at a soil depth of 0–30 cm was higher than that at 30–200 cm. However, the content of soil total phosphorus(TP) was stable throughout the soil layer. The ratios of soil C∶N, C∶P, and N∶P showed similar dynamic patterns to soil carbon and nitrogen. 2) The content of C, N, and P in the leaf was similar to that in soil, with maximum values observed at 10 years. The ratios of leaf C∶N, C∶P, and N∶P first decreased and then increased. 3) There was no significant correlation between the stoichiometry characteristics of the soil and plant(P > 0.05). These results indicate that after 10 years, some management measures should be taken to improve the quality of soil and growth of alfalfa.
To investigate the changes inw nutrients in soil-vegetation ecosystems, Medicago sativa at different ages(1, 10,20, 30 years) was selected to analyze variations in the nutrient content and characteristics of eco-chemical stoichiometry. The results showed that: 1) the content of soil organic carbon(SOC) and total nitrogen(TN) first increased and then decreased as age increased, the vertical distribution of SOC and TN at a soil depth of 0–200 cm was consistent at all alfalfa grasslands, and the content of SOC and TN at a soil depth of 0–30 cm was higher than that at 30–200 cm. However, the content of soil total phosphorus(TP) was stable throughout the soil layer. The ratios of soil C∶N, C∶P, and N∶P showed similar dynamic patterns to soil carbon and nitrogen. 2) The content of C, N, and P in the leaf was similar to that in soil, with maximum values observed at 10 years. The ratios of leaf C∶N, C∶P, and N∶P first decreased and then increased. 3) There was no significant correlation between the stoichiometry characteristics of the soil and plant(P > 0.05). These results indicate that after 10 years, some management measures should be taken to improve the quality of soil and growth of alfalfa.
引文
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