本文關(guān)鍵詞：思茅松人工林細根動態(tài)和碳儲量研究　出處：《中國林業(yè)科學(xué)研究院》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 思茅松人工林 細根 生物量 碳儲量 土壤有機碳儲量

【摘要】：思茅松(Pinus kesiya var.langbianensis)是云南省重要的材脂兼用樹種和高儲量碳匯林造林樹種,開展思茅松人工林細根動態(tài)和碳儲量的研究可以為云南省人工林土壤碳庫的精確估算提供基礎(chǔ)數(shù)據(jù)。細根在森林生態(tài)系統(tǒng)和循環(huán)中具有重要作用,因此有必要開展對思茅松人工林細根生物量和碳儲量、分解等方面的研究。本文以云南省普洱市思茅區(qū)和景谷縣的思茅松天然林和不同林齡、不同造林密度思茅松人工林為研究對象,開展了細根生物量和碳儲量、細根的分解、生物量的分配格局和相對生長方程以及思茅松土壤碳儲量和施肥對幼樹生長的影響等的研究,主要研究結(jié)果如下:(1)在0-30cm土層中,思茅松細根生物量最高的是15年生思茅松人工林,為14.44±3.55 t.hm-2,最低的是天然林,為6.78±0.71 t.hm-2;隨著林齡的增加其他雜細根生物量增加,天然林中其他雜細根生物量顯著高于思茅松人工林中其他雜細根生物量。細根生物量具有明顯的垂直分布特點,隨著土層深度加深,細根生物量減小。思茅松人工林和天然林中活細根生物量顯著高于死細根生物量。隨著造林密度的減小,思茅松細根生物量減少,當造林密度達到2m×2m時思茅松細根生物量又開始增加;造林密度和其他雜細根生物量之間呈極顯著負相關(guān)關(guān)系,林齡和思茅松細根總生物量之間呈極顯著負相關(guān)關(guān)系,與思茅松活細根生物量和死細根生物量之間呈顯著負相關(guān)關(guān)系。(2)在0-30cm土層中,30年思茅松人工林和天然林細根碳含量顯著高于其他林齡思茅松人工林,隨著林齡增加細根碳含量呈增加的變化趨勢;思茅松天然林和30年林齡思茅松人工林細根碳儲量最小,隨著土層厚度的加深思茅松細根碳儲量減少;0-20cm土層中細根碳儲量的貢獻率超過70%。(3)細根和針葉分解干重殘留率最小的是天然林;不同密度思茅松人工林中細根和針葉干重殘留率最小的是密度2m×3m;思茅松細根分解系數(shù)的變化范圍為0.1125-0.2248,針葉分解系數(shù)的變化范圍為0.0538-0.1051。細根和針葉的分解在最初兩個月和9月前后分解相對較快。(4)思茅松的粗根、大根、中根和小根的根長和比根長隨徑級增加而增大,細根的比根長降低;中根、小根和細根在根生物量中所占的比例隨徑級增大先減小后增加,粗根和大根先增加后減小。同一徑級中,細根的比根長遠高于其它根系類型;思茅松各器官生物量分配大小比例為:干枝根葉果,樹干生物量均占全株生物量50%以上,各器官生物量隨著徑級的增大而增加,地上生物量和地下生物量之間呈顯著正相關(guān)。思茅松單株地上部分生物量范圍在2.23~324.95kg之間,根生物量的范圍在0.52-41.80kg之間,根頸、主根和側(cè)根的生物量隨徑級增加而增加,根頸/主根、根頸/總根、側(cè)根/主根與胸徑和樹高呈顯著正相關(guān),主根/總根與胸徑和樹高呈顯著負相關(guān)。思茅松中幼齡、近熟林和過熟林喬木碳儲量分別為47.52±2.27 t·hm-2、116.88±9.19 t·hm-2和242.71±17.20t·hm-2,隨著林齡的增加喬木碳儲量增加,且不同林齡喬木碳儲量之間差異顯著。(5)思茅松人工林中齡林中,SOC含量、全氮和C:N隨著土層加深而減少,容重隨著土層加深而增加。不同的坡向和坡度顯著影響SOC儲量大小,陽坡的SOC儲量要顯著高于陰坡,坡度為20-30°的SOC儲量要顯著低于10-20°和0-10°,坡位對思茅松中齡林的SOC儲量大小無顯著影響。在0-100cm土層中,隨著土層深度的增加,不同立地條件的思茅松人工林中齡林的SOC儲量呈減小的趨勢,不同坡向、坡位和坡度0-20cm土層SOC儲量都顯著高于其它土層。坡向和坡度顯著影響0-20cm土層的SOC儲量(P0.05);坡位對各層SOC儲量均無顯著影響(P0.05)。0-20cm土層中SOC儲量和容重呈極顯著負相關(guān),和坡向、坡度呈顯著負相關(guān)關(guān)系;除20-40cm土層外,其他土層的SOC儲量與全氮之間呈極顯著正相關(guān);SOC儲量和坡位與C:N在任一土層均無顯著相關(guān)關(guān)系。(6)不同養(yǎng)分補給對思茅松幼樹的基徑、株高、總生物量和分枝數(shù)以及各器官生物量分配均無顯著影響。不同養(yǎng)分補給中,干和枝的碳含量最高,根的碳含量最低;針葉中的氮、磷含量和N:P在所有器官中均為最高;不同處理根中C:N含量最大,其次為枝和干,針葉的最小,根中的N:P最小。
[Abstract]:Simao pine (Pinus kesiya var.langbianensis) is an important material of forestation tree species and tree species in Yunnan province and high fat reserves to carry out research on carbon sequestration, Simao pine plantation root dynamic and carbon storage can provide basic data for accurate estimation of soil carbon pool in Yunnan province plantations. Fine root plays an important role in forest ecosystem and circulation therefore, it is necessary to carry out the forest of Simao pine root biomass and carbon storage, decomposition and other aspects of the research. This paper takes Yunnan Pu'er City Simao district and Simao Jinggu County pine natural forest and different ages, different planting density of Simao pine plantation as the research object, carry out the fine root biomass and carbon storage, fine root decomposition of biomass allocation pattern and relative growth equation and the Simao research on the sapling growth effect of soil carbon storage and fertilization of pine, the main results are as follows: (1) 0-30cm in soil In Simao, the pine root biomass was highest in pine plantations in Simao for 15 years, 14.44 + 3.55 t.hm-2, the lowest is the natural forest, 6.78 + 0.71 t.hm-2; with the increase in age of other kinds of fine root biomass increased, natural forest in other miscellaneous fine root biomass was significantly higher than that of Simao pine plantation in the other miscellaneous fine root biomass. The vertical distribution of fine root biomass has obvious characteristics, with the increasing of soil depth, root biomass decreased. The amount of live fine root biomass of Simao pine plantation and natural forest were significantly higher than that of dead fine root biomass. With the decrease of planting density, Simao pine root biomass decreased when the planting density was 2m * 2m when Simao pine root biomass began to increase; between planting density and other miscellaneous fine root biomass had a significant negative correlation between age and Simao pine between the total fine root biomass was negatively related, and the Simao fine living A significant negative correlation between root biomass and necromass. (2) in the 0-30cm soil layer, and natural forest fine root carbon content of 30 years of Simao pine plantation was significantly higher than that in other age Simao pine plantation, with the age increase of root carbon content showed the increasing trend; Simao pine natural forest and 30 years of age Simao pine plantation root carbon storage is the smallest, with the deepening of soil thickness of Simao pine root carbon storage decreased; fine root carbon storage in 0-20cm layer, the contribution rate of more than 70%. (3) and the dry weight of root needle decomposition residual rate is the smallest natural forest; different density of Simao pine heavy residue rate is the lowest density of 2m * 3M root dry and coniferous plantations; changes in the scope of Simao pine root decomposition coefficient is 0.1125-0.2248, the variation range of the decomposition coefficients for 0.0538-0.1051. decomposition of coniferous fine roots and needles in the first two months before and after September and divided relatively Fast. (4) coarse roots, Simao pine root, root diameter and root root length and specific root length increases, the specific root length of the roots decreased; in root, root and root for root biomass in proportion with the increase of the diameter class decreased first and then increased, coarse root and root first after the increase was reduced. The same level, fine root long-term than other root types; Simao pine biomass distribution ratio of root and leaf size: stock fruit, stem biomass accounted for more than 50% of whole plant biomass, biomass of each organ increased with increasing diameter, there was a significant positive correlation between the aboveground biomass and underground biomass. Simao pine plant aboveground biomass in the range of 2.23~324.95kg, the range of root biomass between 0.52-41.80kg, root biomass, taproot and lateral root increased with the increase of diameter, root / root, root / root, lateral root and root / DBH and the tree height A significant positive correlation with total root / root diameter and tree height was negatively correlated. Simao pine sapling, nearly mature forest and over mature forest carbon reserves were 47.52 + 2.27 t hm-2116.88 + 9.19 T + 17.20t 242.71 hm-2 and hm-2, with the increase of the forest age tree carbon stocks increased, the difference and not the same age of tree carbon reserves significantly. (5) SOC in the forest of Simao pine forest, Zhongling, total nitrogen and C:N decreased with the increase of soil depth, soil bulk density increased with soil depth. Different slope and slope significantly influence on SOC SOC reserves, reserves should be significantly higher than that of shady slope, slope 20-30 degree SOC reserves was significantly lower than 10-20 DEG and 0-10 DEG, slope position on Si Maosong middle age forest reserves the size of SOC had no significant effect. In the 0-100cm soil layer, with the increase of soil depth, different site conditions of Simao pine plantation forest reserves is Zhongling SOC decreases, Different slope, slope position and slope soil 0-20cm SOC reserves are significantly higher than other soil. Slope and slope significantly affected soil SOC 0-20cm reserves (P0.05); slope position had no significant effect on each layer of SOC reserves (P0.05) showed a significant negative correlation with SOC reserves and density in the.0-20cm soil layer, and slope. There was a significant negative correlation between soil slope; in addition to 20-40cm, SOC and other soil nitrogen reserves were positively correlated; SOC reserves and slope position and C:N have no significant correlation in either soil. (6) different nutrient supply of Simao pine seedling basal diameter, plant height, have no significant effect on the total the biomass and the number of branches and biomass distribution. Different nutrient supply in the stem and branches of the highest carbon content, the carbon content in the root is the lowest; needles of nitrogen, phosphorus and N:P in all organs were the highest; C:N content of different treatments in the root of the largest, followed by branch and stem, leaf The smallest N:P is the smallest in the root.

【學(xué)位授予單位】：中國林業(yè)科學(xué)研究院
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：S791.24
，

本文編號：1385013