本文選題：鄱陽湖 + 沙山�。� 參考：《江西師范大學(xué)》2014年碩士論文

【摘要】：鄱陽湖地區(qū)作為南方沙化的典型分布區(qū)，沙化土地面積達(dá)3.89萬公頃，主要分布于彭澤、湖口、都昌、星子、永修、新建等濱湖地區(qū)。為闡明鄱陽湖典型沙化分布區(qū)土壤、植物養(yǎng)分化學(xué)計(jì)量特征，為沙化土地分布區(qū)的植被恢復(fù)提供科學(xué)依據(jù)，本研究于鄱陽湖濱湖都昌縣多寶沙山沿沙化梯度測(cè)定了17種常見植物葉片、土壤的有機(jī)碳(C)、全氮(N)、全磷(P)含量。此外，鑒于濕地松(Pinus elliottii)在過去十幾年中已成功引種并大規(guī)模栽種于鄱陽湖濱湖沙山，本研究在對(duì)沙山整體土壤-植物的C、N、P化學(xué)計(jì)量特征探討的基礎(chǔ)上，還重點(diǎn)分析了不同林齡濕地松葉片及林下土壤的C、N、P化學(xué)計(jì)量特征。主要研究結(jié)果如下： （1）鄱陽湖沙山土壤有機(jī)碳、全氮、全磷含量變化范圍分別為0.26%～1.54%，0.014%～0.078%，，0.010%～0.031%。且三者變化模式均表現(xiàn)為隨著沙化程度的降低，含量呈逐漸增加的態(tài)勢(shì)。 （2）沙山17種主要植物葉有機(jī)碳、全氮、全磷變化范圍分別為347.9～428.9mg g-1、3.1～22.7mg g-1和0.7～2.1mg g-1，平均值(±標(biāo)準(zhǔn)差)分別為391.3±25.8mg g-1、10.8±4.3mg g-1和1.2±0.4mg g-1。 （3）土壤0～10cm、10～30cm、30～50cm層C:N變化范圍分別為9.8～46.3、2.4～46.5和3.7～45.0，相應(yīng)土層C:P范圍分別為19.8～75.9、3.0～90.5和4.7～76.5，N:P范圍分別為0.4～3.7、0.4～2.9和0.7～3.4。 （4）植物C:N、C:P對(duì)沙化的響應(yīng)模式一致，均表現(xiàn)出在重度沙化區(qū)數(shù)值最小，N:P則表現(xiàn)為在中度沙化區(qū)數(shù)值最小，C:N、C:P變化主要取決于葉片的N、P含量。土壤C:N隨沙化程度增加表現(xiàn)出增加趨勢(shì)，而C:P、N:P表現(xiàn)出降低趨勢(shì)。土壤C:N和N:P的變化受控于土壤N含量，C:P變化則決定于土壤有機(jī)C含量。 （5）10年生濕地松葉片N:P平均值為20.63，10年生以下濕地松葉片N:P平均值為15.61，隨著林齡的增加，濕地松生長由N、P共同限制逐漸轉(zhuǎn)向更受P的限制。 （6）濕地松葉片C:N、C:P明顯高于其它植物，表現(xiàn)出更高的固碳優(yōu)勢(shì)和養(yǎng)分利用效率，濕地松的引種對(duì)于沙山地表植被覆蓋度的快速提高具有明顯的效果。沙山濕地松葉片C、N、P及其化學(xué)計(jì)量比中葉N與C:N對(duì)沙化程度和林齡變化反應(yīng)最為敏感，對(duì)于診斷或評(píng)估濕地松在沙山的生長狀況具有一定的指示作用。
[Abstract]:As a typical distribution area of desertification in the south, Poyang Lake area is 38900 hectares, mainly distributed in Pengze, Hukou, Duchang, Xingzi, Yongxiu, newly built and other littoral areas. In order to elucidate the stoichiometric characteristics of soil and plant nutrients in typical desertification distribution area of Poyang Lake, it provides scientific basis for vegetation restoration in sandy land distribution area. In this study, the contents of organic carbon (C _ (C), total nitrogen (N _ (N), N _ (N), P (P) in leaves of 17 common plant species in Duchang County, Duchang County, Poyang Lake, along the sandy gradient were determined. In addition, in view of the successful introduction of Pinus elliottii (Pinus elliottii) in the past ten years and its large-scale planting in the coastal sand mountains of Poyang Lake, the present study is based on the study of the chemical characteristics of the soil and plants in the sand mountains. The characteristics of CnnP in leaves and soil of Pinus elliottii at different forest ages were also analyzed. The main results are as follows: 1) the change range of soil organic carbon, total nitrogen and total phosphorus in Shashan Mountain of Poyang Lake is 0.26 and 1.54 respectively. With the decrease of desertification degree, the contents of all three change patterns are gradually increasing. (2) the leaf organic carbon and total nitrogen of 17 main plants in Shashan Mountain. The range of variation of total phosphorus is 347.9~428.9mg g-1C 3.1mg g -1 and 0.7~2.1mg g -1, the mean value (鹵standard deviation) is 391.3 鹵25.8mg g -1 10.8 鹵4.3mg g -1 and 1.2 鹵0.4mg g -1 respectively. In the corresponding soil layer, the range of C: P was 19.875.93.00.0.5 and 4.777.5N: P were 0.43.70.29and 0.73.4. respectively.) the response pattern of plant C: Nu C: P to desertification was the same. All of them showed that the minimum value of N: P in heavy desertification zone was the minimum value of C _ (1) N _ (1) C _ (P) in moderate desertification zone, and the change of C _ (1) N _ (10) C _ (P) was mainly dependent on the content of N _ (10) P in leaves Soil C: n showed an increasing trend with increasing the degree of desertification, while C: Pu N / P showed a decreasing trend. The change of soil C: n and N: P is controlled by the change of soil N content and C: P content, but the change of soil organic C content is determined by the change of soil N: P content. (5) the average value of N: P in the leaves of 10-year-old Pinus elliottii is 20.63, and the average value of N: P in leaves of Pinus elliottii under 10 years old is 15.61, with the increase of forest age. The growth of Pinus elliottii was gradually changed from the common restriction of Nu P to that of P. (6) the leaves of Pinus elliottii were significantly higher than those of other plants, showing higher carbon sequestration and nutrient utilization efficiency. The introduction of Pinus elliottii has obvious effect on the rapid increase of vegetation coverage. The leaves of Pinus elliottii and their stoichiometric ratios were most sensitive to the change of desertification degree and forest age, and could be used to diagnose or evaluate the growth status of Pinus elliottii in Shashan.
【學(xué)位授予單位】：江西師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：Q948

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