Measuring the Fate of Compost-Derived Phosphorus in Native Soil below Urban Gardens
Measuring the Fate of Compost-Derived Phosphorus in Native Soil below Urban Gardens
复制标题
测量城市花园下方原生土壤中堆肥衍生磷的去向
DOI：
--
复制
发表时间：
2019
影响因子：
--
通讯作者：
A. Kay
中科院分区：
文献类型：
--
作者：
G. Small;S. Osborne;Paliza Shrestha;A. Kay
城市园艺对堆肥投入的严重依赖为从城市废物流中回收养分提供了机会，但也造成了土壤磷（P）积累和损失的可能性。我们之前记录了施用堆肥的高床花园渗滤液中的 P，但该 P 的去向尚不清楚。在这里，我们测量了为研究而建立的四年或六年的城市花园地块下方土壤中的磷浓度。我们假设花园建立后，土壤磷浓度和磷渗透深度将随着时间的推移而增加。在每个年龄的五个园地中收集土壤核心，并对无机弱交换性磷进行定量。相对于参考土壤剖面，园地下方（>35厘米深）的原生土壤中无机弱交换性磷显着升高，并且过量磷随着深度的增加而减少，尽管不同年龄的园地之间的差异并不显着。我们的分析表明，堆肥中多余的磷会积聚在城市花园地块下方的原生土壤中。虽然城市农业有潜力在城市生态系统中回收磷，但过度施用堆肥有可能导致土壤和水污染。
The heavy reliance on compost inputs in urban gardening provides opportunities to recycle nutrients from the urban waste stream, but also creates potential for buildup and loss of soil phosphorus (P). We previously documented P in leachate from raised-bed garden plots in which compost had been applied, but the fate of this P is not known. Here, we measured P concentrations in soils below four or six-year-old urban garden plots that were established for research. We hypothesize that the soil P concentration and depth of P penetration will increase over time after gardens are established. Soil cores were collected in five garden plots of each age and quantified for inorganic weakly exchangeable P. Inorganic weakly exchangeable P was significantly elevated in native soil below garden plots (>35 cm deep) relative to reference soil profiles, and excess P decreased with increasing depth, although differences between garden plots of different ages were not significant. Our analysis shows that excess P from compost accumulates in native soil below urban garden plots. While urban agriculture has the potential to recycle P in urban ecosystems, over-application of compost has the potential to contribute to soil and water pollution.
DOI：
10.2495/dne-v13-n4-415-422
发表时间：
2018
影响因子：
--
作者：
Small, G.;Shrestha, P.;Kay, A.
通讯作者：
Kay, A.
城市花园堆肥中过量的磷造成潜在的污染热点
影响因子：
2.9
作者：
Small, Gaston;Shrestha, Paliza;Metson, Geneviève Suzanne;Polsky, Katherine;Jimenez, Ivan;Kay, Adam
通讯作者：
Kay, Adam