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对不同演替阶段的树种细根生产动态及其对环境因子响应的差异目前仍缺乏了解。为此,在福建省三明市选择了中亚热带演替前期的马尾松(Pinus massoniana)和演替后期的米槠(Castanopsis carlesii)两种人工林为研究对象,采用微根管法对两种人工林的细根根长生产量及其动态进行了为期2年的观测,并分析了细根生产量的径级和土层分布,及月生产量动态与气温、降水、土壤温度、土壤含水率等环境因子间的关系。结果表明:1)两种林分的细根生产量有显著差异,马尾松人工林细根年根长生产量约为米槠人工林细根年根长生产量的4倍;两种林分的细根生产量呈现显著的月变化,峰值均出现在夏季,且2年内总细根生产量以夏季的细根生产量最大。2)两林分均是直径0–0.3 mm的细根所占细根生产量比例最大;土层分布上,马尾松人工林0–10 cm土层细根所占生产量的比例最大,米槠人工林30–40 cm土层细根所占生产量比例最大。3)偏相关分析表明,两林分细根月生产量均与气温、土壤温度极显著相关或显著正偏相关,与降水、土壤含水率的偏相关均不显著;一元线性回归分析表明,演替早期马尾松人工林细根月生产量与气温、土壤温度的相关性明显高于米槠人工林。该研究表明,与演替后期的米槠人工林相比,中亚热带演替早期的马尾松人工林细根生产量大,且与温度间的相关性更高。
At present, there is still a lack of understanding of the fine root production dynamics and their differences in responses to environmental factors in different succession stages. Therefore, we selected two plantations Pinus massoniana and Castanopsis carlesii in the early successional stage of Central Asia subtropics in Sanming City, Fujian Province as the research object, and used two kinds of artificial The results showed that the fine roots’ long-term productivity and its dynamics were observed for 2 years and the diameter and soil layer distribution of fine root production were analyzed. The monthly production dynamics and temperature, precipitation, soil temperature and soil moisture Such as the relationship between environmental factors. The results showed that: 1) There was a significant difference in the fine root production between the two stands. The fine root length production of Pinus massoniana plantation was about 4 times of that of the fine root of Pinus tabulaeformis plantation. The fine root production of the two stands Significant monthly changes in the amount showed the peak appeared in the summer, and two years the total fine root production in summer to produce the largest fine root. 2) The fine roots with the diameter of 0-0.3 mm accounted for the largest proportion of fine roots in both stands. The distribution of fine roots in the 0-10 cm layer of Masson pine plantation had the largest proportion of fine roots,槠 The proportion of fine roots in the 30-40 cm layer of the plantation is the largest. 3) Partial correlation analysis showed that the monthly yield of fine root in two stands was significantly or positively correlated with temperature and soil temperature, but not significantly correlated with precipitation and soil water content. The linear regression analysis showed that, The correlation between monthly yield of fine roots of Pinus massoniana plantations and air temperature and soil temperature was significantly higher than that of poplar plantation. The study showed that compared with the late succession Mirabilis plantation, the mass production of Pinus massoniana plantations in the early successional mid-subtropical forests was larger and more correlated with temperature.