Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, and School of Environmental and Resource Sciences, Zhejiang Agricultural and Forestry University, Lin'an, Zhejiang Province, China.
PLoS One. 2013;8(2):e57705. doi: 10.1371/journal.pone.0057705. Epub 2013 Feb 25.
Treated biosolids have been applied to 750-ha of a Pinus radiata forest plantation on Rabbit Island near Nelson City in New Zealand since 1996. A long-term research trial was established in 1997 to investigate the effects of the biosolids applications on the receiving environment and tree growth. An analysis of the likely economic impact of biosolids application shows that biosolids application has been beneficial. Stem volume of the high treatment (biosolids applied at 600 kg N ha(-1) every three years) was 36% greater than the control treatment (no biosolids applied), and stem volume of the standard treatment (300 kg N ha(-1)) was 27% greater than the control treatment at age 18 years of age. Biosolids treatments have effectively transformed a low productivity forest site to a medium productivity site. Although this increased productivity has been accompanied by some negative influences on wood quality attributes with reduced wood stiffness, wood density, and larger branches, an economic analysis shows that the increased stem volume and greater average log diameter in the biosolids treatments outweighs these negative effects. The high and standard biosolids treatments are predicted to increase the net stumpage value of logs by 24% and 14% respectively at harvesting, providing a large positive impact on the forest owner's economic return.
自 1996 年以来，新西兰纳尔逊市附近兔子岛上的辐射松人工林已应用处理后的生物固体 750 公顷。1997 年建立了一项长期研究试验，以调查生物固体应用对接收环境和树木生长的影响。对生物固体应用可能产生的经济影响的分析表明，生物固体应用是有益的。高处理（每三年施 600 公斤氮/公顷生物固体）的树干体积比对照处理（未施生物固体）大 36%，而标准处理（300 公斤氮/公顷）的树干体积比对照处理大 27%，在 18 岁时。生物固体处理有效地将低生产力的林地转变为中生产力的林地。尽管这种生产力的提高伴随着一些对木材质量属性的负面影响，如木材硬度降低、密度降低和树枝增大，但经济分析表明，生物固体处理中增加的树干体积和更大的平均原木直径超过了这些负面影响。高生物固体处理和标准生物固体处理预计将分别在收获时使原木的净材积价值增加 24%和 14%，这对林主的经济回报有很大的积极影响。
