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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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Two merging methods of Bézier curves are generalized to tensor product Bé zier surfaces, we propose two methods to approximate two pieces of adjacent tensor product Bézier surfaces by a piece of tensor product Bézier surface. We offer the explicit formulas of the merged tensor product Bézier surfaces with all kinds of merging conditions.
同样,Bézier曲线的两种合并方法也被成功的推广到张量积Bézier曲面上,得到把两片相邻张量积Bézier曲面合并成一片张量积Bézier曲面的两种合并方法,并给出在各种合并条件下的合并曲面控制顶点的显示表示式。
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be available for:有效
be attentive to 对...关怀 | be available for 有效 | be aware of 知道,意识到,认识到
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be available for:可得到的;可利用的
available: adj.可用到的, 可利用的, 有用的, 有空的, 接受探访的 | be available for: 可得到的;可利用的 | 9:Sea lions are known for their athleticism...海狮的运动能力力众所周知.
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be available for:有效的,可获得的
be attached to 亲近;亲密; 附属于,隶属于 | be available for 有效的,可获得的 | be aware of 意识到,觉察到,知道
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be available for:可得到的;有效的;可利用的
had better 最好 | be available for可得到的;有效的;可利用的 | make sure确保、、、
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be available for sth:有空做某事
appropriate adj. 合适的 | be available for sth 有空做某事 | be over the moon 快活极了
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