College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
Bioresour Technol. 2013 Feb;130:463-71. doi: 10.1016/j.biortech.2012.12.044. Epub 2012 Dec 17.
To investigate the effect of pyrolysis temperature on properties and nutrient values, biochars were produced from giant reed (Arundo donax L.) at 300-600°C and their properties such as elemental and mineral compositions, release of N, P and K, and adsorption of N and P were determined. With increasing temperatures, more N was lost and residual N was transformed into heterocyclic-N, whereas no P and K losses were observed. P was transformed to less soluble minerals, resulting in a reduction in available-P in high-temperature biochars. A pH of⩽5 favored release of NH(4)(+), PO(4)(3-) and K(+) into water. Low-temperature biochars (⩽ 400°C) showed appreciable NH(4)(+) adsorption (2102mgkg(-1)). These results indicate that low-temperatures may be optimal for producing biochar from giant reed to improve the nutrient availability.
为了研究热解温度对性质和养分含量的影响，我们在 300-600°C 的温度下，由巨菌草（Arundo donax L.）制备生物炭，并对其元素和矿物质组成、氮、磷和钾的释放以及氮和磷的吸附等性质进行了测定。随着温度的升高，更多的氮被损失，残留的氮转化为杂环氮，而没有观察到磷和钾的损失。磷转化为溶解度较低的矿物质，导致高温生物炭中有效磷减少。pH 值⩽5 有利于 NH(4)(+)、PO(4)(3-)和 K(+)释放到水中。低温生物炭（⩽ 400°C）对 NH(4)(+)的吸附能力较强（2102mgkg(-1)）。这些结果表明，低温可能是从巨菌草生产生物炭以提高养分有效性的最佳温度。
