施肥對(duì)荒漠草原土壤呼吸和溫室氣體通量的影響.pdf

1、分類號(hào) S158.3 學(xué)校代碼 10129U D C 631.4 學(xué) 號(hào) 201320461施肥對(duì)荒漠草原土壤呼吸和溫室氣體通量的影響Effect of fertilization on Soil respiration rate and greenhousegases flux in the desert steppe申 請(qǐng) 人：楊朕軼學(xué)位類別：農(nóng)業(yè)推廣碩士領(lǐng) 域：農(nóng)業(yè)資源利用指導(dǎo)教師：紅梅 教授論文提交日期：二〇一五年六月Effec

2、t of fertilization on Soil respiration rate and greenhouse gases flux in the desert steppeAbstractIn breviflora desert grassland,with the LI-8100 carbon flux measuring instrumentand black box method ,To study soil respir

3、ation rate of the seasonal and interannualvariation,and the changes of greenhouse gas emissions in seasonal,and the relationshipbetween the impact factors in the different fertilization levels. Results are as follows:1.

4、The soil respiration rate(1) The soil respiration rate increased under the nitrogen application, Characteristicperformance for N10 ＞ CK ＞ N5 ＞ N2.5;N, P, NP cells, NP Fertilizer significantlyincrease soil respiration rat

5、e, their relationship is that NP＞P＞CK＞N10.(2) With the temperature increases, The soil respiration rate achieved a peak inmiddle of July and August, The rule of variation of soil respiration rate has’t comparedchanged wi

6、th no fertilization village, fertilization has not changed the variation of soilrespiration rate.(3) The soil respiration rate have a significantly relationship with soil temperature in5 cm and 0 ~ 10 cm,The main affecti

7、ng soil respiration are soil temperature and soilmoisture in desert steppe.2. Ecosystems greenhouse gas flux(1) In three different nitrogen gradient in the district,CH4 absorb flux relationship isCK＞N2.5＞N10＞N5,CO2 emiss

8、ion flux relationship is N5＞CK＞N10＞N2.5,N2Oemission flux relationship is CK＞N5＞N2.5＞N10; N, P, NP within the district, CH4absorb flux relationship is P＞CK＞NP＞N10,CO2 emission flux relationship is NP＞P＞CK＞N10,N2O emission

9、 flux relationship is CK＞NP＞P＞N10.(2) Compared with the fertilization district, fertilization does not change the rule ofthe greenhouse gas emission flux in the whole growing season；(3) Greenhouse gas flux have a signifi

10、cantly correlation the soil of 5 cm groundtemperature and soil water content. The main affecting greenhouse gases flux are soiltemperature and soil moisture in desert steppe.Keywords Keywords: Desert grassland ;Soil resp