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Total N increased significantly in the rhizosphere, hut total P and total K decreased. However, the available N, P and K in the rhizosphere behaved in an opposite way: with available N decreased but available P and available K increased in the rhizosphere except fur Phragmites communis Trin. Deficit of available N is the most significant, and accumulation of available P and available K were the least for Salsola nitraria Pall. among all seven halophytes.
在所有研究植物中,根际土壤中全N含量比土体的含量高,但全P和全K含量却比土体的含量低;根际土壤中有效态养分的变化则与全态相反,根际土壤中的有效N含量比土体中的都显著降低,除芦苇外,其他六种盐生植物根际土壤中有效P和有效K的含量都高于土体,但有效P的富集不及有效K富集的程度高。
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The results showed that the spatial distribution range of soil fertility in Qinling forest area on south slope was soil pH volue 5.97~6.89,organic matter 6.6~50.1 g·kg~-1, total N 0.5~3.8 g·kg~-1 ,available N 33.6~257.3 mg·kg~-1,available P 0.81~5.8 mg·kg~-1,available K 38.9~262.4 mg·kg~-1,clay particle content 11.3%~18.1%,capacity of exchangeable base 68.5~310.2 mmol·kg~-1 respectively; The spatial variation degree of available P, organic matter, and total N was big,whereas clay particle content and active acid pH value was small;the spatial variation degree of soil pH value, organic matter, available P, clay particle content, and capacity of exchangeable base decreased with the deep of soil,whereas soil total N、available N, and available K increased.
结果表明,秦岭南坡土壤肥力指标在整个土壤剖面空间分异范围分别为:土壤pH值5.97~6.89,有机质含量6.6~50.1 g·kg-1,土壤全N含量0.5~3.8 g·kg-1,碱解N含量33.6~257.3 mg·kg-1,速效P含量0.81~5.8 mg·kg-1,速效K含量38.9~262.4 mg·kg-1,粘粒含量11.3%~18.1%,阳离子代换量68.5~310.2 mmol·kg-1;其空间分异程度以速效P、有机质和土壤全N含量较大,土壤粘粒含量和土壤pH值较小;随着土层的加深,土壤pH值、有机质、速效P、土壤粘粒含量和阳离子代换量空间分异程度减小,而土壤全N、碱解N和速效K含量空间分异程度增大。
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The rhizosphere soil microorganism and rhizosphere soil enzyme activity werepositive correlated with each other.Except aerobic bacteria and actinomycetes andfungi did not achieve significant or extreme significant correlation with urease,theother factors all achieved significant or extreme significantcorrelation.Besides,through a correlation analysis between rhizosphere agrobiologyand rhizosphere soil nutrient,except rapidly available K was negative correlation with urease and catalase,the other agrobiology factors were positive correlation with soilnutrient, aerobic bacteria and sucrase and catalase were extreme significantcorrelation with alkaline hydrolytic N and organism matter and rapidly available P;actinomycetes was extreme significant correlation with all soil nutrient factors;fungiwas extreme significant correlation with alkaline hydrolytic N and organism matterand rapidly available P, significant correlation with rapidly available K;urease wasextreme significant correlation with alkaline hydrolytic N, significant correlation withrapidly available P.
本试验所测定的根系土壤微生物与根系土壤酶活性间均呈正相关,除了好、气性细菌、放线菌、真菌与脲酶间未达到显著或极显著相关外,其余因子间均呈显著或极显著相关;此外,通过根系土壤生物学因子与根系土壤养分相关分析,发现除了速效K与脲酶、过氧化氢酶呈负相关外,其余生物因子与土壤养分因子间均呈正相关,其中,好气性细菌、蔗糖酶、过氧化氢酶与水解N、有机质和速效P极显著相关;放线菌与所有养分因子间均极显著相关;真菌与水解N、有机质和速效P极显著相关,与速效K显著相关;脲酶与水解N极显著相关,与速效P显著相关。
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Now, prancer and vixen:烈马和悍妇
Now, dasher! Now, dancer!|猛男!淑女 | Now, prancer and vixen!|烈马和悍妇 | Now, comet! Now, cupid! Now, donner and blitzen!|彗星!爱神!唐纳和布利茨恩!
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