不同杉木无性系生物量碳储量的差异及其对土壤肥力的影响

发布时间：2018-06-05 19:33

本文选题：无性系 + 杉木　；参考：《浙江农林大学》2017年硕士论文

【摘要】：杉木[Cunninghamia lanceolata(lamb.)Hook]是我国特有的速生用材树种之一,具有良好的经济价值和生态价值。前人对于杉木连栽的生长量及对土壤理化性质的影响已有较多的研究,但往往只是针对单一品系而进行的。本论文的科学问题是不同杉木无性系具有不同的生长特性,对于连栽后的生物量碳及土壤质量必定会产生较大的影响。针对上述问题,在前人研究的基础上,调查了浙江省开化县林场‘B44’、‘K13’、‘KT13’、‘F13×那1’和‘CK’等5个无性系一、二代杉木林分的生物量碳储量,同时采集并分析了相应林地土壤有机碳、溶解性有机碳氮、微生物量碳氮、土壤酶等肥力指标。主要研究结果如下:(1)5个杉木无性系的高生长在同一代际之间没有显著性差异;二代栽培明显减缓了‘CK’、‘F13×那1’、‘KT13’和‘B44’4个无性系的胸径生长量(P0.05),平均下降了14.4%。(2)5个杉木无性系的生物量碳储量及年固碳量较大的差异。除无性系‘K13’外,其它4个无性系二代栽培生物量碳显著低于一代(P0.05)。二代栽培明显减缓了杉木的年固碳量,平均下降了30.40%,其中以‘K13’下降的幅度最小,仅下降13.30%。(3)二代栽培杉木林地土壤有效磷、土壤微生物量碳、土壤蔗糖酶、土壤水溶性有机碳氮比显著下降(P0.05)。(4)杉木生物量碳与13个土壤质量因子的回归方程为:Y=-96.01-14.69X_1+1.51X_3+0.36X_6+7.35X_7+0.09X_9+95.87X_(11)-5.71X_(12)-3.40X_(13)。杉木生物量碳与土壤有效磷、有机碳、水溶性有机碳、水溶性有机氮、过氧化氢酶等5个指标有极显著正相关(P0.01),而与土壤pH、酸性磷酸酶和蔗糖酶呈极显著负相关(P0.01)。
[Abstract]:Chinese fir [Cunninghamia lanceolata(lamb.)Hook] is one of the special fast growing timber species in China, which has good economic and ecological value. Previous studies on the growth of Chinese fir and the effects on soil physical and chemical properties have been carried out, but only for a single strain of Chinese fir (Cunninghamia lanceolata). The scientific problem in this paper is that different clones of Chinese fir have different growth characteristics, which will have a great influence on biomass carbon and soil quality after continuous planting of Cunninghamia lanceolata (Cunninghamia lanceolata). In view of the above problems, based on the previous studies, the biomass carbon reserves of the first and second generation Cunninghamia lanceolata stands in Kaihua County, Zhejiang Province, were investigated. Soil organic carbon, dissolved organic carbon, microbial biomass carbon and soil enzyme were collected and analyzed. The main results were as follows: (1) there was no significant difference in the height growth of five Chinese fir clones between the same generations, and the second generation cultivation significantly slowed down the growth of F13 脳 Na-1C. The increment of DBH of KT13 'and B44' clones was P0.05, which decreased the biomass carbon storage and annual carbon sequestration of 5 Chinese fir clones. Except for clone K13', the biomass carbon of the second generation of the other four clones was significantly lower than that of P0.05. The annual carbon sequestration of Chinese fir was obviously slowed down by the second generation cultivation, and the average carbon sequestration decreased 30.40%, in which the decrease of K13 'was the least, and the decrease was only 13.30.3.The soil available phosphorus, soil microbial biomass carbon and soil sucrose enzyme were decreased in the second generation cultivated Chinese fir woodland. The regression equation between biomass carbon of Cunninghamia lanceolata and 13 soil quality factors was: 1 1.51X_3 0.36X_6 7.35X_7 0.09X_9 95.87X1 1.51X_3 0.36X_6 7.35X_7 0.09X_9 95.87X1 1.51X_3 0.36X_6 7.35X_7 0.09X_9. The biomass carbon of Chinese fir was positively correlated with soil available phosphorus, organic carbon, water-soluble organic nitrogen and catalase, but negatively correlated with soil pH, acid phosphatase and sucrase.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S791.27;S714.8

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