Huiying Cai, Yang Lin, Yatao Liang, Guang Yang, Long Sun
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Carbon (C), nitrogen (N), and phosphorus (P) contents in leaves, branches, and fine roots and rhizosphere soil, C-, N- and P-acquiring enzyme activities were examined. Microbial biomass C, N, and P were measured, and factors influencing C:N:P stoichiometry of plants during the burned area restoration were explored. Our results show that C and N contents in leaves increased with time since fire, while C and P in branches and C, N and P in fine roots decreased. Activities of C-, N-, and P-acquiring enzymes and microbial biomass N increased with time since fire. Redundancy analysis showed that changes in soil N-acquiring enzyme activity, microbial biomass C, and N had significant effects on plant ecological stoichiometry. These results show a significant flexibility in plant nutrient element allocation strategies and C:N:P stoichiometric characteristics. 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引用次数: 0
摘要
植物的化学计量和养分分配可能反映了对环境养分变化的适应策略。火灾作为森林中的主要干扰因素,会影响土壤养分的供应,从而影响植物养分的动态变化。然而,人们对火灾后不同时期的植物-土壤化学计量分配策略以及土壤、酶和微生物生物量对植物化学计量的影响还知之甚少。本研究以中国北方烧毁森林中的先锋树种桦树(Betula platyphylla)为研究对象,并选择了不同火灾年份的严重烧毁区域。附近未被烧毁的区域作为对照。研究考察了树叶、树枝、细根和根瘤土壤中碳(C)、氮(N)和磷(P)的含量,以及碳、氮和磷获取酶的活性。测量了微生物生物量 C、N 和 P,并探讨了影响焚烧区恢复期间植物 C:N:P 化学计量的因素。结果表明,叶片中的 C 和 N 含量随着火灾后时间的推移而增加,而枝条中的 C 和 P 以及细根中的 C、N 和 P 含量则有所下降。随着火灾后时间的推移,碳、氮和磷获取酶的活性以及微生物生物量 N 均有所增加。冗余分析表明,土壤中氮获取酶活性、微生物生物量 C 和 N 的变化对植物生态平衡有显著影响。这些结果表明,植物营养元素分配策略和 C:N:P 生态平衡特征具有很大的灵活性。土壤胞外酶活性推动了火灾后恢复过程中生态平衡的变化。
Time since fire affects ecological stoichiometry of plant–soil–microbial systems of Betula platyphylla, a pioneer species in burnt areas of China’s boreal forest
Plant stoichiometry and nutrient allocation may reflect adaptation strategies to environmental nutrient changes. Fire, as a major disturbance in forests, mediates soil nutrient availability that may influence plant nutrient dynamics. However, plant–soil stoichiometric allocation strategies during different post-fire periods and the effects of soil, enzymes, and microbial biomass on plant stoichiometry are largely unknown. The pioneer tree species Betula platyphylla in burnt forests of northern China was the object of this study, and severely burned areas selected with different fire years. Nearby unburned areas acted as a control. Carbon (C), nitrogen (N), and phosphorus (P) contents in leaves, branches, and fine roots and rhizosphere soil, C-, N- and P-acquiring enzyme activities were examined. Microbial biomass C, N, and P were measured, and factors influencing C:N:P stoichiometry of plants during the burned area restoration were explored. Our results show that C and N contents in leaves increased with time since fire, while C and P in branches and C, N and P in fine roots decreased. Activities of C-, N-, and P-acquiring enzymes and microbial biomass N increased with time since fire. Redundancy analysis showed that changes in soil N-acquiring enzyme activity, microbial biomass C, and N had significant effects on plant ecological stoichiometry. These results show a significant flexibility in plant nutrient element allocation strategies and C:N:P stoichiometric characteristics. Soil extracellular enzyme activity drives the changes in stoichiometry during the process of post-fire restoration.
期刊介绍:
The Journal of Forestry Research (JFR), founded in 1990, is a peer-reviewed quarterly journal in English. JFR has rapidly emerged as an international journal published by Northeast Forestry University and Ecological Society of China in collaboration with Springer Verlag. The journal publishes scientific articles related to forestry for a broad range of international scientists, forest managers and practitioners.The scope of the journal covers the following five thematic categories and 20 subjects:
Basic Science of Forestry,
Forest biometrics,
Forest soils,
Forest hydrology,
Tree physiology,
Forest biomass, carbon, and bioenergy,
Forest biotechnology and molecular biology,
Forest Ecology,
Forest ecology,
Forest ecological services,
Restoration ecology,
Forest adaptation to climate change,
Wildlife ecology and management,
Silviculture and Forest Management,
Forest genetics and tree breeding,
Silviculture,
Forest RS, GIS, and modeling,
Forest management,
Forest Protection,
Forest entomology and pathology,
Forest fire,
Forest resources conservation,
Forest health monitoring and assessment,
Wood Science and Technology,
Wood Science and Technology.