...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plant and Soil >Effects of CO2 and nitrogen fertilization on vegetation and soil nutrient content in juvenile ponderosa pine.
【24h】

Effects of CO2 and nitrogen fertilization on vegetation and soil nutrient content in juvenile ponderosa pine.

机译：二氧化碳和氮肥对美国黄松的植被和土壤养分含量的影响。

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

Based on a review of the literature on nutrient uptake and soil responses in open-top chambers planted with ponderosa pine (Pinus ponderosa) treated with both N and CO2, it was hypothesized that (1) increased CO2 would cause increased growth and yield of biomass per unit uptake of N even if N was limiting, and (2) increased CO2 would cause increased biomass yield per unit uptake of other nutrients only by growth dilution and only if they were non-limiting. In trials in 1991-93 in open-top chambersin Placerville, California, USA, ponderosa pines were exposed to ambient CO2 or 525 or 700 鎙 CO2 litre-1 and given 0, 10 or 20 g N m-2 year-1. Results showed that hypothesis 1 was supported only in part: there were greater yields of biomass per unit N uptake in the first two years of growth but not in the third year. Hypothesis 2 was supported in many cases: increased CO2 caused growth dilution (decreased concentrations but not decreased uptake) of P, S and Mg. Effects of increased CO2 on K, Ca and B concentrations were smaller and mostly not significant. There was no evidence that N responded in a unique manner to increased CO2. Simple growth dilution seemed to explain nutrient responses in almost all cases. There were significant declines in soil exchangeable K+, Ca2+, Mg2+ and extractable P over time which were attributed to disturbance effects associated with ploughing. The only statistically significant treatment effects on soils were negative effects of increased CO2 on mineralizable N and extractable P, and positive effects of both N fertilizer and CO2 on exchangeable Al3+. Soil exchangeable K+, Ca2+ and Mg2+ pools remained much higher than vegetation pools, but extractable P pools were lower than vegetation pools in the third year of growth.There were also large losses of both native soil N and fertilizer N over time. These soil N losses could account for the observed losses in exchangeable K+, Ca2+ and Mg2+ if N was nitrified and leached as NO3-.
机译：根据有关氮和CO2处理的美国黄松（Pinus tankerosa）种植的开放式室中养分吸收和土壤响应的文献综述，我们假设（1）CO2增加会导致生长和生物量增加。即使限制了氮的吸收，每单位N的吸收量也增加了;（2）增加的CO2仅通过生长稀释并且只有在非限制性的条件下，才会导致单位吸收其他营养素的生物量增加。 1991-93年在美国加利福尼亚州普莱瑟维尔的开顶室内进行的试验中，黄松树暴露于环境CO2或525或700 700 CO2升1中，并给予0、10或20 g N m-2 year-1。结果表明，假设1仅得到部分支持：在生长的前两年，每单位N吸收的生物量产量更高，而在第三年则没有。假说2在许多情况下均得到支持：CO2增加导致P，S和Mg的生长稀释（浓度降低，但摄取量未降低）。 CO2增加对K，Ca和B浓度的影响较小，并且大部分不显着。没有证据表明氮以独特的方式对增加的二氧化碳作出反应。简单的生长稀释似乎可以解释几乎所有情况下的养分响应。随着时间的推移，土壤可交换的K +，Ca2 +，Mg2 +和可提取的P显着下降，这归因于耕作带来的干扰效应。在土壤上唯一具有统计学意义的处理效果是增加CO2对可矿化氮和可提取P的负面影响，以及氮肥和CO2对可交换Al3 +的积极影响。在生长的第三年，土壤可交换的K +，Ca2 +和Mg2 +池仍远高于植被池，但可提取的P池低于植被池，并且随着时间的推移，天然土壤N和肥料N的损失也很大。如果氮被硝化并以NO3-的形式浸出，那么这些土壤中的N损失可以解释为可交换的K +，Ca2 +和Mg2 +的损失。

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