【作者】 张昌顺；

【导师】 范少辉；

【作者基本信息】 中国林业科学研究院 ， 森林培育， 2008， 博士

【摘要】 毛竹（Phyllostachys edulis）是我国分布最广、面积最大、经济价值最高的竹种。毛竹林不仅具有较高的经济和社会价值,而且在涵养水源、保持水土等方面具有重要的生态功能。闽北山区是我国毛竹分布和种植的主要地区,也是南方典型的丘陵区。由于竹林集约经营强度大,该地区的山坡度大,降雨量及强度大且集中,水土流失和地力维护等方面的生态问题突出。因此,如何在大规模高效培育和利用毛竹林资源的同时,提高毛竹林生态系统服务功能成为目前亟待解决的重大科学问题。本文以闽北常绿阔叶林（CK_K）和南方速生丰产的杉木林（CK_S）为对照,以闽北山区主要毛竹林类型——毛竹纯林(T_ZC)、8竹2阔林(T_ZK1)、6竹4阔林(T_ZK2)和杉竹混交林(T_ZS)为研究对象,分析评价6种林分结构特征及主要生态功能—群落结构、生物多样性、土壤性质维持、水源涵养和土壤抗侵蚀性,旨在比较不同毛竹林综合生态功能差异,为南方丘陵区发展毛竹林培育、水土流失防治及竹林可持续经营提供理论依据和技术指导,同时,为竹林生态功能野外观测积累经验。主要研究结论如下:（1）对不同类型毛竹林群落结构研究表明:6种群落植物隶属86科166属231种,其中蕨类植物13科21属30种,裸子植物2科2属2种,被子植物71科143属199种;科以单种科和寡种科为主,占总科数的80.40%;属内种数变化范围为1⁷,其中单种属最多,占总属数的78.31%。T_ZC、T_ZK1、T_ZK2、T_ZS、CK_S和CK_K的植物分别隶属55科90属118种、76科128属156种、68科120属148种、38科54属60种、42科57属64种和73科109属129种。β分布对于拟合试验林分胸径、树高和年龄分布较好。（2）不同类型林分物种多样性研究表明:群落物种数呈现随阔叶树比例增加而增加的态势,其中乔木层以CK_K物种最丰富,多样性指数最高,分布最均匀,均优多度最高;灌木层以T_ZK1物种丰富度、多样性和均优多度最高,CK_K均匀度最高,T_ZS和CK_S生态优势度最高;草本层T_ZK2物种丰富度和均优多度最高,多样性和均匀度以CK_K最高,生态优势度T_ZS最高。群落总体物种丰富度T_ZK1最高,多样性和均匀度CK_K最高,均优多度T_ZK2最高,生态优势度CK_S最高。生物多样性指数与生物量相关性不显著。（3）采用多指标、多种分析方法研究林地土壤性质,结果表明:土壤物理性质状况CK_K最佳,T_ZK1次之,CK_S最差;CK_K土壤养分状况最佳,其众多土壤养分含量最高,T_ZS最低;土壤酶活性以T_ZK1最佳,6种酶中4种酶活性最高,CK_S土壤酶活性最差,其所有酶活性均最低。土壤细菌占土壤微生物总量比例最大,达96.20%以上,放线菌数量次之,真菌数量最少。聚类分析和土壤性质综合评价得出各林分土壤性质综合指数依次为:CK_K>T_ZK1>T_ZC>T_ZK2>T_ZS>CK_S,说明T_ZK1在竹林中土壤性质最佳。土壤微团聚体与众多土壤理化性质、土壤生物活性因子间存在极显著或显著的负相关关系,说明土壤微团聚体分形维数在作为土壤质量诊断指标方面具有较好的应用潜力。整体上,各林分土壤分形维数大小状况如下:CK_K<T_ZK2<T_ZK1<T_ZC<CK_S<T_ZS。（4）不同林分水源涵养功能研究表明:林冠截留量和截留率均以CK_K最高,分别为408mm和18.09%,CK_S次之,分别为391.19mm和17.33%,竹林以T_ZS最高,分别为366.95mm和16.26%,T_ZK1最低,分别为325mm和14.41%。林冠截留量和林冠截留率与降雨量和林内降雨的曲线关系显著;不同林地不同类型枯落物储量及总储量差异较大,其中未分解层、半分解层和已分解枯落物均以CK_S最高,T_ZC最低,林地枯落物总储量以CK_K次之,T_ZC最低。林地枯落物持水量和吸水速率不仅与枯落物状态相关,还与浸水时间相关,并建立了它们分别与浸水时间的曲线模型,土壤贮水量随土层增加而减小。土壤最大贮水量以CK_K最高,T_ZK1次之,CK_S最低,其三层平均贮水量分别为:1125.67 t·hm-2、1100.60 t·hm-2和1008 t·hm-2。水源涵养总量以CK_K最高,CK_S次之,T_ZC最低,分别为:747.20mm、696.53mm和641.17mm,毛竹林中以T_ZS最高,为683.26mm,T_ZK1次之,为656.73mm。（5）土壤抗侵蚀性指标研究表明:土壤有机质、水稳性指数、结构系数、入渗速率（初渗速率、稳渗速率、平均速率和渗透总量）、根重、根长和抗冲性指数随土层增加而降低,而结构体破坏率团聚度、分散率和分散系数等随土层增加而增加,表明林地土壤抗侵蚀性能随土层增加而减弱。因子分析和主分量分析表明,土壤水稳性指数、抗冲性指数、土壤有机质含量与众多土壤理化性质、生物活性、土壤抗侵蚀性指标之间存在极显著或显著的相关关系,在土壤抗侵蚀性第一主分中具有较大的负荷,可作为表征林地土壤抗侵蚀性的综合参数。各林分土壤抗侵蚀性综合指数大小次序依次为:T_ZS>T_ZK2>T_ZK1>CK_K>CK_S>T_ZC,说明竹林尤其毛竹混交林林地土壤具有较强的抗侵蚀性能。（6）对各林分主要生态功能综合定量评价表明,各林分生态功能综合指数大小为:CK_K>T_ZK1>T_ZK2>T_ZC>T_ZS>CK_S。说明森林生态功能随阔叶树比例增加而呈现增强的态势。因此,在南方山区、丘陵区发展和经营毛竹林时,可适当增加阔叶树比例,提高竹林整体生态功能,达到发展竹林种植和治理水土流失相结合。更多还原

【Abstract】 Moso bamboo （Phyllostachys edulis）, which is most widely distributed in South China, has the largest amount and highest economic value among the bamboo species. It has not only high economic and social values, but also other important ecological functions, such as water and soil conservation. With large areas of hills and mountains, the Northern Fujian Province, is major region of P. edulis’s distribution and cultivation. Because of extensive management of P. edulis plantations, the soil erosion, soil productivity maintenance and others ecological problems are very serious. Therefore, it is a important scientific issues that how to enhance the ecosystem service function in cultivating and utilizing P. edulis resources in high-effect and on a large scale. In this paper, the community structure and major ecological functions （biodiversity, soil property, water and soil conservation） of six types of forests—Evergreen broadleaved forest （CK_K）, Cunninghamia lanceolata forest （CK_S）, P. edulis pure foresty (T_ZC), eight P. edulis and two broad-leave tree mixed stands (T_ZK1), six P. edulis and four broad-leave tree mixed stands (T_ZK2（）typles T_ZK1 and T_ZK2, the proportion of broad-leaved tree is about 20% and 40% respectively)and Mixed forest of C. lanceolata and P. edulis (T_ZS) were studied. The aims were to compare the difference of different P. edulis forests’s compositive ecological functions, provide theoretical and technical guidances for P. edulis forest silvilcuture, controlling of water and soil loss and sustainable management in hilly area of Southern China, and also accumulate field experience for researching bamboo forestry’s ecological functions. The main conclusions are as follows:（1） Stand vegetable research were carried by using community survey, and the results were that the plant species in those six stands were belong to 86 families, 166 generas and 231 species which included 80.40 percent families and 78.31 percent generas that were composed one or one to four species. Among them, there are 30 species of pteridophyte from 13 families and 21 genera, 2 species of gyrmnosperms from 2 families and 2 genera, and 199 species angiosperms from 71 families and 173 genera. There are 55 families, 90 generas and 118 species, 76 families, 128 generas and 156 species, 68 families, 120 generas and 148 species, 38 families, 54 generas and 60 species, 42 families, 57 generas and 64 species, 73 families, 109 generas and 129 species respectively in T_ZC, T_ZK1, T_ZK2, T_ZS, CK_S and CK_K stands.βdistribution model was better in fitting tree height, DBH and age distribution pattern.（2） Through bio-diversity analyzing, the number of communities species increased with the rate of broad-leaved species of plantation, and CK_K had abundant species（S）, the highest Margalef richness index（R）, Simpson index（D）, Shannanon-Weiner index（H′）, Pielou evenness index（E） and evenness-dominance-abundance index（Z）, the lowest ecological dominance（λ） in the tree layer. In the shrub layer, the biggest S, R, D, H′and Z were in T_ZK1, the biggest E was in CK_K, and the biggestλwere in T_ZS and CK_S. In the herbaceous layer, T_ZK2 had the biggest S, R and Z, CK_K had the biggest D, H′and E, and CK_S had the biggestλ. On the community level, S and R were biggest in T_ZK1, the biggest D, H′and E were in CK_K, the biggest Z was in T_ZK2, and T_ZS had the biggestλ. The nonlinear relationship between bio-diversity indices and community biomass was not significant.（3） Soil property status had been studied through multiple parameters and several quantitative methods in all test stands. The soil physical properties analyzing showed that CK_K had the best soil physical properties, T_ZK1′s secondly, while, CK_S′s was worst. According to soil chemical properties research, CK_K soil had the best soil chemical properties, which was highest among nutrients contents in all stands. On the contrary, T_ZS′s chemical properties was worst, many of its soil nutrients were lest. The soil enzyme activity of T_ZK1 was the best, the max value of oil enzyme activity of six were in it stands, CK_S′s soil enzyme was worst because of soil enzyme activity value were worst. The percent of the Bacteria in microorganisms was more than 96.20%, so the rate of soil bacteria was higher than that of soil fungi and actinomycetes, and the number of soil fungi was lest. The magnitude of soil property comprehensive indexes of different test stands was CK_K>T_ZK1>T_ZC>T_ZK2>T_ZS>CK_S, this indicated that T_ZK1′s soil property was best in bamboo forestry. There existed highly significant or very significant negative relationship between the fractal dimension of soil micro-aggregates and many soil property indexes of soil physical and chemical properties, soil enzyme activity and soil microbiology quantity, and it is good for soil micro-aggregates fractal dimension in evaluating soil property, and the value of soil fractal dimension of different test stands was CK_K<T_ZK2<T_ZK1<T_ZC<CK_S<T_ZS.（4） The water-holding capacity of canopy,litter layer,and soil were further studied in all test stands,and the results showed interception by canopy （391.19mm） and the average canopy interception rate （17.33） of CK_K were highest, While, in bamboo forestry, T_ZS’s interception by canopy（366.95mm） and its rate （16.26%） were much more than any other, the second in T_ZC foresty（335.71mm and 14.88%）, the lest in T_ZK1 foresty（325.25mm and 14.41%）, the interception by canopy and its rate were in very significant nolinear relationship with rainfall and throughfall respectively. The storages of different decomposed state and total forest litter are differed with stand, and the biggest storage of undecomposed litter, half-decomposed litter and decomposed litter were all in CK_S, by contraries, all of them were lest in T_ZC stands, and the second biggest of total litter storage in CK_K. The water-holding capacity of litter and its absorption rate changed not only with litter decomposed state, also with immersion time, and the curve regression model of them had been established. Soil water content decreased with the soil depth, and the maximum in CK_K followed by T_ZK1, and the minimum in CK_S, the their average soil water content of three layers （0²0cm, 20⁴0cm and 40⁶0cm） were 1125.67 t·hm-2, 1100.60 t·hm-2 and 1008.87 t·hm-2. In all, the water-holding capacity of forestry were highest （747.20mm） in CK_K, the second （696.53） in CK_S, the lest （641.17） in T_ZC, and in bamboo forestry, the biggest was T_ZS （683.26mm） followed by T_ZK1 （656.73mm）.（5） Soil anti-erodibility of six stands showed that the content of organic matter, water stable index, soil structure coefficient, infiltration velocity, root weight, root length, and soil anti-scourability index decreased with the depth of soil, while, the damage rate of soil structure, aggregate degree, disperse rate and its coefficient increased with soil depth, indicating capability of soil anti-erosion decreased with the increase soil layer. The soil water stable index, anti-scourability index and the content of organic matter were in highly significant or very significant correlation with many soil physical and chemical properties indexes and soil biological activity indexes after Correlation Analysis and Principal component analysis, and they all had higher positive loading in the first principal component, so they can be used as a comprehensively quantitative index to evaluate the soil erosion resistance. The value of soil erosion resistance comprehensively quantitative index in different test stands was T_ZS>T_ZK2>T_ZK1>CK_K>CK_S>T_ZC, it indicated that bamboo forestry especially T_ZS, has better soil erosion resistance.（6） Comprehensive evaluation on six types of forests’main ecological functions showed that the decreasing order of it in different stands was CK_K>T_ZK1>T_ZK2>T_ZC>T_ZS>CK_S, this indicated that there is trend that forest ecosystem function enhanced with the increase of the rate of the broad-leaved tree, and P. edulis forestry especially T_ZK1, had better forest ecosystem function. So, increasing percent of broadleaved species can be used to guide improving P. edulis forestry ecological function in cultivating and managing P. edulis forestry.更多还原