【摘要】：為探討沙漠公路防護(hù)林地表凋落物的分解速率和養(yǎng)分釋放動(dòng)態(tài)對(duì)施肥的響應(yīng),采用凋落物分解袋法,對(duì)塔里木沙漠公路防護(hù)林地喬木狀沙拐棗(Calligonum arborescens)同化枝、梭梭(Haloxylon ammodendron)同化枝和多枝檉柳(Tamarix ramosissima)枝凋落物在施肥處理下的分解及養(yǎng)分釋放特征進(jìn)行研究。結(jié)果表明:經(jīng)過(guò)420d的分解,3種凋落物質(zhì)量殘留率在對(duì)照(不施肥)、施用氮肥、施用磷鉀復(fù)合肥處理間存在顯著性差異(P0.05)。喬木狀沙拐棗同化枝、梭梭同化枝和多枝檉柳枝在對(duì)照處理下的質(zhì)量殘留率分別為56.95%、31.32%和50.24%。施肥處理下3種凋落物均呈現(xiàn)出梭梭同化枝分解速率最快,多枝檉柳枝次之,喬木狀沙拐棗同化枝分解最慢。施用磷鉀復(fù)合肥極顯著提高了3種凋落物的分解速率(P0.01);施用氮肥則促進(jìn)多枝檉柳枝的分解,抑制喬木狀沙拐棗和梭梭同化枝的分解。凋落物分解過(guò)程中,對(duì)照組3種植物凋落物的C、N、P和K元素均呈現(xiàn)凈釋放狀態(tài);施肥后凋落物的N、P和K元素呈現(xiàn)出富集-釋放的模式。凋落物初始P含量和C/N、C/P比值是分解初期的主導(dǎo)因素,初始K、木質(zhì)素、纖維素含量和C/N、木質(zhì)素/N比值是分解后期的主要控制因素。研究表明,施肥顯著影響沙漠公路防護(hù)林地表凋落物的分解,增加防護(hù)林地表凋落物的養(yǎng)分歸還量,延后養(yǎng)分釋放的時(shí)間,改善塔里木沙漠公路防護(hù)林地的土壤肥力。凋落物初始C/N比值是預(yù)測(cè)塔里木沙漠凋落物分解的重要因素,且不同分解時(shí)期影響凋落物分解的初始化學(xué)組成有所差異。
[Abstract]:In order to study the decomposition rate of surface litter and the response of nutrient release dynamics to fertilization in desert highway shelter forest, the (Calligonum arborescens) assimilation branch of Arbor Elaeagnus angustifolia in Tarim Desert Highway Shelter Forest was studied by litter decomposition bag method. The characteristics of decomposition and nutrient release of (Haloxylon ammodendron) assimilated branches and (Tamarix ramosissima) branches of Tamarix chinensis were studied under fertilization. The results showed that after 420 days of decomposition, there were significant differences among the treatments of control (no fertilization), application of nitrogen fertilizer and compound fertilizer of phosphorus and potassium (P0.05). The residual rates of assimilation branches of Arbor, Haloxylon ammodendron and Tamarix chinensis were 56.95% and 50.24%, respectively. Under fertilization treatment, the decomposition rate of the assimilated branches of Haloxylon ammodendron was the fastest, followed by the branches of Tamarix chinensis, and the assimilation branch of Arbor was the slowest. The application of phosphorus and potassium fertilizer increased the decomposition rate of three litter species (P0.01), and the application of nitrogen fertilizer promoted the decomposition of Tamarix chinensis branches and inhibited the decomposition of the assimilating branches of Arbor Jujube and Haloxylon ammodendron. In the process of litter decomposition, the C ~ (+) N ~ (+) P and K elements of the three plant litters in the control group showed a net release state, while the N _ (+) P and K elements in the litter showed a pattern of enrichment and release after fertilization. The initial P content and C / N / P ratio of litter were the dominant factors in the early stage of decomposition, while the initial K, lignin, cellulose content and C / N, lignin / N ratio were the main controlling factors in the later stage of decomposition. The results showed that fertilization significantly affected the decomposition of litter, increased the amount of nutrient return, delayed the release of nutrients, and improved the soil fertility of shelterbelt on Tarim desert highway. The initial C / N ratio of litter is an important factor in predicting litter decomposition in Tarim desert, and the initial chemical composition of litter decomposition is different in different decomposition periods.
【作者單位】： 中國(guó)科學(xué)院新疆生態(tài)與地理研究所;新疆大學(xué)資源與環(huán)境科學(xué)學(xué)院;中國(guó)科學(xué)院大學(xué);國(guó)家荒漠-綠洲生態(tài)建設(shè)工程技術(shù)研究中心;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41271341,41030530,41301038) 塔里木油田公司項(xiàng)目(971012080007) 水利公益性行業(yè)科研專項(xiàng)(201401049)
【分類號(hào)】：S714

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 宋新章;江洪;張慧玲;余樹(shù)全;周?chē)?guó)模;馬元丹;Scott X. Chang;;全球環(huán)境變化對(duì)森林凋落物分解的影響[J];生態(tài)學(xué)報(bào);2008年09期

2 王相娥;薛立;謝騰芳;;凋落物分解研究綜述[J];土壤通報(bào);2009年06期

3 曲浩;趙學(xué)勇;趙哈林;王少昆;;陸地生態(tài)系統(tǒng)凋落物分解研究進(jìn)展[J];草業(yè)科學(xué);2010年08期

4 許湘琴;林植華;陳慧麗;;凋落物分解對(duì)土壤生物的影響[J];生態(tài)學(xué)雜志;2011年06期

5 王苗苗;侯扶江;;草地凋落物分解的主要影響因素[J];草業(yè)科學(xué);2012年10期

6 石福臣,丁寶永,閏秀峰,朱廷棟;三江平原天然次生柞木林凋落物分解規(guī)律的研究[J];東北林業(yè)大學(xué)學(xué)報(bào);1990年S3期

7 莫江明,孔國(guó)輝,Sandra BROWN,方運(yùn)霆,張佑昌;鼎湖山馬尾松林凋落物及其對(duì)人類干擾的響應(yīng)研究[J];植物生態(tài)學(xué)報(bào);2001年06期

8 陳金林,吳春林,姜志林,許新建;櫟林生態(tài)系統(tǒng)凋落物分解及磷素釋放規(guī)律[J];浙江林學(xué)院學(xué)報(bào);2002年04期

9 邵玉琴 ,趙吉 ,楊R，

本文編號(hào)：2173999