...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plant and Soil >Phosphorus intensity determines short-term P uptake by pigeon pea (Cajanus cajan L.) grown in soils with differing P buffering capacity.
【24h】

Phosphorus intensity determines short-term P uptake by pigeon pea (Cajanus cajan L.) grown in soils with differing P buffering capacity.

机译：磷的强度决定了在具有不同磷缓冲能力的土壤中生长的木豆（Cajanus cajan L.）的短期P吸收。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Phosphorus (P) uptake by plant roots depends on P intensity (I) and P quantity (Q) in the soil. The relative importance of Q and I on P uptake is unknown for soils with large P sorption capacities because of difficulties in determining trace levels of P in the soil solution. We applied a new isotope based method to detect low P concentrations (&20 micro g P l-1). The Q factor was determined by assessment of the isotopically exchangeable P in the soil (E-value) and the I factor was determined by measurement of the P concentration in the pore water. A pot trial was set up using four soils with similar labile P quantities but contrasting P buffering capacities. Soils were amended with KH2PO4 at various rates and pigeon pea (Cajanus cajan L.) was grown for 25 days. The P intensity ranged between 0.0008 and 50 mg P l-1 and the P quantity ranged between 10 and 500 mg P kg-1. Shoot dry matter (DM) yield and P uptake significantly increased with increasing P application rates in all soils. Shoot DM yield and P uptake, relative to the maximal yield or P uptake, were better correlated with the P concentration in the pore water (R2=0.83-0.90) than with the E-value (R2=0.40-0.53). The observed P uptakes were strongly correlated to values simulated using a mechanistic rhizosphere model (NST 3.0). A sensitivity analysis reveals that the effect of P intensity on the short-term P uptake by pigeon pea exceeded the effect of P quantity both at low and high P levels. However, DM yield and P uptake at a given P intensity consistently increased with increasing P buffering capacity (PBC). The experimental data showed that the intensity yielding 80% of the maximal P uptake was 4 times larger in the soil with the smallest PBC compared to the soil with the largest PBC. This study confirms that short-term P uptake by legumes is principally controlled by the P intensity in the soil, but is to a large extent also affected by the PBC of the soil..
机译：植物根系对磷的吸收取决于土壤中磷的强度（I）和磷的数量（Q）。对于具有较大P吸附能力的土壤，Q和I对P吸收的相对重要性尚不明确，因为难以确定土壤溶液中的痕量P。我们应用了一种基于同位素的新方法来检测低P浓度（<20 micro g P-1）。通过评估土壤中同位素可交换的P（E值）来确定Q因子，通过测量孔隙水中的P浓度来确定I因子。盆栽试验使用了四种不稳定的P量但P缓冲能力相反的土壤。用KH2PO4对土壤进行不同程度的改良，并将木豆（Cajanus cajan L.）种植25天。 P强度在0.0008至50mg P l-1之间，并且P量在10至500mg P kg-1之间。在所有土壤中，随P施用量的增加，苗干物质（DM）的产量和P吸收显着增加。相对于最大产量或P吸收量，茎干DM产量和P吸收量与孔隙水中P浓度（R2 = 0.83-0.90）的相关性比与E值（R2 = 0.40-0.53）更好。观察到的P吸收与使用机械根际模型（NST 3.0）模拟的值高度相关。敏感性分析表明，低磷和高磷水平下，磷强度对木豆短期吸收磷的影响均超过了磷含量的影响。但是，在给定的P强度下，DM产量和P吸收量随P缓冲能力（PBC）的增加而持续增加。实验数据表明，与最大PBC的土壤相比，PBC最小的土壤产生的最大P吸收量的80％的强度大4倍。这项研究证实，豆类植物对短期P的吸收主要受土壤中P强度的控制，但在很大程度上还受土壤PBC的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号