摘要
【目的】泡桐人工林立地质量评价是揭示泡桐生长与立地因子间关系的重要方法,是在南方丘陵山地进行泡桐推广种植的前提,对其进行研究可为南方丘陵山地泡桐大径材林培育提供科学依据。【方法】使用115块泡桐人工林标准样地调查数据,运用数量化理论Ⅰ,分析各立地因子对泡桐人工林生长的影响,筛选出主导立地因子并划分立地类型。统计分析各标准地优势木平均胸径与年龄的关系,应用导向曲线方法推导编制了南方低山丘陵区泡桐人工林立地指数表,并以所编制的立地指数表对所划分的立地类型进行立地质量评价。【结果】1)影响泡桐人工林生长的立地因子中,重要性排序为:坡向>石砾含量>海拔>土壤质地>坡度>土壤容重>坡位,坡向和石砾含量是影响泡桐人工林立地质量的主导因子。2)以坡向和石砾含量2个主导立地因子对泡桐人工林立地类型进行划分,最终将南方丘陵山地泡桐人工林的立地类型划分为12个类型。3)对数曲线方程D=2.696 1+22.528 7lg A是合适的导向拟合曲线,经χ2检验和落点检验证明所编制的立地指数表合格。4)应用所编制的立地指数表对南方丘陵山地泡桐人工林进行立地质量评价,处于较高立地指数水平的样地占39.13%、处于中等立地指数水平的样地占38.26%、处于较差立地指数水平的样地占10.43%。【结论】南方丘陵山区泡桐人工林立地质量总体上处于中等以上水平;阴坡低石砾含量、半阴半阳坡低石砾含量和半阴半阳坡较低石砾含量这3个立地类型生产潜力最高,最适宜作为培育泡桐大径材林的立地类型。
【Objective】Site quality evaluation of Paulownia plantation is an important method to reveal the relationship between the growth of Paulownia and its site factors, which is the premise for Paulownia planting in hilly and mountainous areas of South China.The research can provide references for the cultivation of large diameter timber forests in the hilly and mountainous areas of South China.【Method】Based on the data of 115 sample plots of Paulownia plantations, the quantitative theory Ⅰ was used to analyze the influence of site factors on the growth of Paulownia plantation, select the dominant site factors and classify site types. A site index table of Paulownia plantation was constructed based on the model made by the statistical relationship between dominant tree DBH in each plot and the corresponding tree′s age. The site quality of the Paulownia plantation was evaluated by using the table above.【Result】1) The importance order of the site factors affecting the growth was: slope aspect > gravel content > altitude > soil texture > slope > soil bulk density > slope position. Slope aspect and gravel content were the dominant site factors affecting the site quality of Paulownia plantation. 2) The site types of Paulownia plantation were classified into 12 types based on slope aspect and gravel content as the two dominant site factors. 3) The logarithm curve equation of D=2.696 1+22.528 7lgA was the best fit among the selected curves. The table was demonstrated to be of high accuracy when tested with two methods: chi-square test and test of falling point. 4) The results showed that 39.13% of the sample plots were at high site quality levels, 38.26% were at medium site quality levels and 10.43% were at poor site quality levels.【Conclusion】The site quality of Paulownia plantation in the hilly area of South China is generally above the medium level. The three site types of low gravel on shady slopes, low gravel on semi-shady and semi-sunny slopes and low gravel on semi-shady and semi-sunny slopes have the highest productivity potential and are the best sites for Paulownia plantation’s growth.
作者
庞宏东
李玲
杨代贵
唐万鹏
PANG Hongdong;LI Ling;YANG Daigui;TANG Wanpeng(Hubei Academy of Forestry,Wuhan 430075,Hubei,China;Pengchang Forest Farm of Jingmen,Jingmen 448269,Hubei,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2022年第8期40-47,共8页
Journal of Central South University of Forestry & Technology
基金
“十三五”国家重点研发计划项目(2017YFD060050603)。
关键词
泡桐
立地分类
立地指数表
数量化理论
立地质量评价
Paulownia
site classification
site index table
quantification theory
site quality evaluation
