本文選題：寧夏典型草原　切入點：退耕草地　出處：《草業(yè)學報》2017年04期 　論文類型：期刊論文

【摘要】：為了研究寧夏典型草原不同退耕年限草地優(yōu)勢植物及土壤C、N、P化學計量特征,本研究以寧夏南部典型草原區(qū)退耕草地為對象,分別對退耕0、1、3、5、6、8、11、15、20年草地優(yōu)勢植物及土壤碳、氮、磷等生態(tài)化學計量特征進行研究。結果表明,各植物全氮含量均表現(xiàn)為地上部分大于地下部分,且豬毛蒿整體全氮含量較其他植物高。全磷含量除賴草外也表現(xiàn)為地上部分大于地下部分。退耕1年狗尾草和退耕3年賴草有機碳含量表現(xiàn)為地下部分大于地上部分,其余各退耕年限地上部分大于地下部分。優(yōu)勢植物C∶N、C∶P、N∶P整體表現(xiàn)為退耕20年長芒草最大。賴草和豬毛蒿最小。退耕6年以上20年以內(nèi)土壤有機碳含量由表層向深層逐層遞減;全氮含量退耕0~6年呈波動式變化,退耕8年后全氮含量由表層向深層逐層遞減;全磷含量變化趨勢與全氮相同。研究區(qū)土壤C∶N變化范圍為7.08~19.62,C∶P變化范圍為6.60~35.25,N∶P變化范圍為0.82~2.17。各層土壤C∶N平均值變化范圍為11.18~15.03,C∶P平均值變化范圍為14.09~24.55,N∶P平均值變化范圍為1.06~1.98;除C∶N接近我國土壤C∶N均值外,研究區(qū)土壤C∶P和N∶P均低于我國土壤C∶P和N∶P均值。并且相應地表優(yōu)勢植物C∶N、C∶P、N∶P明顯高于表層土壤。本研究中土壤C∶N與土壤有機碳之間相關性不顯著,與全N呈負相關,意味著C∶N主要受N控制,而C∶P與有機碳呈顯著正相關,與全P相關性不顯著。土壤N∶P與土壤全N含量呈顯著正相關,與土壤全P含量相關性不顯著,說明主要受N控制,而土壤全N含量隨退耕年限的增加呈波動式上升趨勢。植物與土壤碳、氮、磷相關性顯示:植物全N與土壤N之間相關性不顯著(P0.05),植物全P與土壤全N、全P呈極顯著的相關關系(P0.01),與土壤有機碳和N∶P呈顯著的相關關系(P0.05)。
[Abstract]:In order to study the chemometric characteristics of dominant plants and soil C _ (N) N _ (P) in grassland with different returning years in typical grassland of Ningxia Autonomous region, this study took the returning grassland of typical grassland area in southern Ningxia as an example. The dominant plants and soil carbon and nitrogen in 20 years were studied respectively. The results showed that the total nitrogen content of each plant was higher than that of the underground part. The total nitrogen content of Artemisia hyacinth was higher than that of other plants, the total phosphorus content was higher than that of underground part in addition to Leymus chinensis, and the organic carbon content of Leymus spp for 1 year and 3 years was higher than that of aboveground part. The above ground part of the other cultivated years was larger than that of the underground part. The dominant plant C: n: P was the largest for 20 years, and the least for Leymus and Artemisia pigeonii. The soil organic carbon content decreased from the surface layer to the deep layer within more than 20 years after returning to tillage for more than 6 years. The total nitrogen content was fluctuating from 0 to 6 years, and the total nitrogen content decreased from the surface layer to the deep layer after 8 years. The change trend of total phosphorus content is the same as that of total nitrogen. The range of variation of soil C: n is 7.08 ~ 19.62C: P = 6.60 ~ 35.25N: P = 0.82N = 2.17. The range of average value of C _ (1) N is 11.181.03 ~ (th) C _ (%) P is 14.0924.55N = 1.06 ~ 1.98; Except that C: n is close to the average value of C: n in the soil of our country, In the study area, soil C: P and N: P were lower than those in our country, and the relative dominant plant C: n: C: P was significantly higher than that of surface soil. The correlation between soil C: n and soil organic carbon was not significant, but negative correlation with total N. It means that C: n is mainly controlled by N, while C: P is significantly positively correlated with organic carbon, but not significantly correlated with total P. Soil N: P is significantly positively correlated with soil total N content, but not with soil total P content, indicating that it is mainly controlled by N. The total N content of soil increased with the increase of returning years. Phosphorus correlation showed that there was no significant correlation between plant total N and soil N, but there was a very significant correlation between plant total P and soil total N, total P showed a very significant correlation (P 0.01), and there was a significant correlation with soil organic carbon and N: P (P 0.05).
【作者單位】： 寧夏大學農(nóng)學院;西北土地退化與生態(tài)恢復省部共建國家重點實驗室培育基地;
【基金】：國家自然科學基金(31360582,31460632)資助
【分類號】：S812

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