本文選題：施肥　切入點(diǎn)：短花針茅草原　出處：《內(nèi)蒙古農(nóng)業(yè)大學(xué)》2015年碩士論文

【摘要】：本研究對(duì)內(nèi)蒙古退化短花針茅荒漠草原進(jìn)行連續(xù)三年施氮肥、磷肥、鉀肥及其配施的試驗(yàn),探討了不同施肥處理對(duì)退化荒漠草原恢復(fù)的影響,通過比較研究2011年～2013年各處理的土壤氮礦化速率、土壤主要肥力要素及植被特征,結(jié)果表明：(1)氮肥、磷肥和氮磷肥配施都顯著提高了荒漠草原生長(zhǎng)季(7、8、9月)的氮礦化速率(NPN10N5PN2.5CK)。(2)氮肥、氮磷肥和氮磷鉀肥配施可以提高荒漠草原土壤的有機(jī)質(zhì)和全氮含量；磷肥、磷鉀肥、氮磷肥和氮磷鉀肥配施對(duì)于增加土壤全磷和速效磷含量有積極作用；鉀肥、氮鉀肥和氮磷鉀肥配施能顯著增加土壤全鉀與速效鉀的含量。(3)氮肥、氮磷肥和氮磷鉀肥配施處理,顯著增加植物群落Pielou指數(shù)、Simpson指數(shù),植物群落的Shannon-Wiener多樣性指數(shù)比對(duì)照處理高,但不顯著。(4)施肥能不同程度的提高荒漠草原植物群落生物量和植物高度,其中氮磷鉀配施能有效提高荒漠草原植物高度；氮磷肥配施顯著提高植物群落地上生物量,菊科、藜科植物尤為明顯；氮鉀肥配施顯著提高植物群落地下生物量;氮肥的連續(xù)施用顯著降低植物群落凋落物量。(5)兩年的相關(guān)性分析結(jié)果表明,施肥第一年,土壤氮礦化速率與土壤全氮以及速效磷有顯著的正相關(guān)關(guān)系,在施肥第二年,土壤氮礦化速率則與土壤全氮以及有機(jī)質(zhì)有顯著的正相關(guān)關(guān)系。說明土壤有機(jī)質(zhì)、全氮以及速效磷含量對(duì)土壤氮礦化速率有較大的影響。
[Abstract]:In this study, the effects of different fertilization treatments on the restoration of degraded desert steppe of Stipa breviflora in Inner Mongolia were studied by applying nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer and their combined fertilizer for three consecutive years.The soil nitrogen mineralization rate, main fertility factors and vegetation characteristics of different treatments from 2011 to 2013 were compared. The results showed that the nitrogen fertilizer was 1: 1.The nitrogen mineralization rate of desert steppe was significantly increased by combined application of phosphorus fertilizer and nitrogen and phosphorus fertilizer. (NPN10N5PN2.5CKK), and the organic matter and total nitrogen content of desert steppe soil were increased by the combination of N and P fertilizer, P fertilizer, P and K fertilizer, P fertilizer, P K fertilizer, P fertilizer, P K fertilizer, P fertilizer, P K fertilizer, P fertilizer, P K fertilizer, P fertilizer, P K fertilizer, P fertilizer, P K fertilizer, P fertilizer, P and K fertilizer,The combined application of N P fertilizer and N P K fertilizer had a positive effect on increasing soil total phosphorus and available P content, and K fertilizer, N K fertilizer and N P K fertilizer could significantly increase the content of soil total K and available K.) N fertilizer, N P fertilizer and N P K fertilizer combined with N P and K fertilizer could significantly increase the content of soil total K, N P and N P K.The Shannon-Wiener diversity index of plant community was higher than that of control treatment, but not significant. Fertilization could improve the biomass and plant height of desert steppe community in different degree.The combination of nitrogen, phosphorus and potassium can effectively improve the plant height of desert steppe, the combination of nitrogen and phosphorus fertilizer can significantly increase the aboveground biomass of plant community, especially the plants of Compositae and Chenopodiaceae, and the combination of nitrogen, potassium and fertilizer can significantly increase the underground biomass of plant community.The results of two years' correlation analysis showed that the rate of soil nitrogen mineralization had a significant positive correlation with total nitrogen and available phosphorus in the first year of fertilization, and in the second year of fertilization, there was a significant positive correlation between nitrogen mineralization rate and soil total nitrogen and available phosphorus.There was a significant positive correlation between soil nitrogen mineralization rate and soil total nitrogen and organic matter.The results showed that the contents of soil organic matter, total nitrogen and available phosphorus had great influence on soil nitrogen mineralization rate.
【學(xué)位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：S812.2

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