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1.
Commercial forestry plantations as a postmining land use in the Upper Hunter Valley of New South Wales, Australia are restricted
by both the poor nutrient availability of mining substrates and low regional rainfall. An experiment was conducted to investigate
whether municipal waste products and saline groundwater from coal mining operations could improve early tree growth without
impacting on the environment through salt accumulation and/or nutrient enrichment and changes in groundwater quality. Potential
impacts were investigated by quantifying the nutrient cycling dynamics within the plantation using an input–output mass balance
approach for exchangeable calcium (Ca2+), exchangeable magnesium (Mg2+), exchangeable potassium (K+), exchangeable sodium (Na+), nitrogen (N), and phosphorus (P). Measured inputs to and outputs from the available nutrient pool in the 0–30 cm of the
overburden subsystem were used to estimate the net effect of unmeasured inputs and outputs (termed “residuals”). Residual
values in the mass balance of the irrigated treatments demonstrated large leaching losses of exchangeable Ca, Mg, K, and Na.
Between 96% and 103% of Na applied in saline mine-water irrigation was leached below the 0–30-cm soil profile zone. The fate
of these salts beyond 30 cm is unknown, but results suggest that irrigation with saline mine water had minimal impact on the
substrate to 30 cm over the first 2 years since plantation establishment. Accumulations of N and P were detected for the substrate
amendments, suggesting that organic amendments (particularly compost) retained the applied nutrients with very little associated
losses, particularly through leaching. 相似文献
2.
通过对完达山地区进行长期调查发展,该地区共有药用植物资源80科224种,并以植物分类学进行了统计,提出了合理开发利用药用植物的建议,为研究和合理利用完达山地区药用植物资源提供了基础材料。 相似文献