School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China; State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China.
Sci Total Environ. 2021 May 15;769:145166. doi: 10.1016/j.scitotenv.2021.145166. Epub 2021 Jan 15.
Salinity stress is common for plants growing in coastal wetlands. The addition of biochar in the soil may alleviate the negative effect of salinity through its unique physicochemical properties. To test this, we conducted a greenhouse experiment where the cosmopolitan wetland plant Phragmites australis was subjected to four salinity treatments (0, 5, 10 and 15‰) and three biochar treatments (no biochar addition, with biochar addition and with biochar-compost addition, both biochar and compost were made from P. australis) in a factorial design. Both biochar addition and biochar-compost addition to the substrate enhanced belowground mass of P. australis, application of biochar-compost significantly increased total mass by 35.5% and net photosynthesis rate of P. australis by 51.4%. Both biochar addition and biochar-compost addition significantly increased soil organic carbon content by 62.9% and 31.7%, respectively, but decreased soil ammonium nitrogen content. In the saline soil, application of the mixture of biochar-compost had a strong, and positive effect on the growth of P. australis, compared to biochar alone. Therefore, incorporation of biochar and compost might be an appropriate approach to improve the productivity of P. australis growing in coastal wetlands, where soil salinity is a common environmental stress.
盐胁迫是生长在沿海湿地的植物常见的问题。土壤中添加生物炭可能通过其独特的物理化学性质缓解盐胁迫的负面影响。为了验证这一点，我们进行了一项温室实验，其中选择广布性湿地植物芦苇（Phragmites australis）作为实验对象，在完全控制的条件下，设置 4 个盐度处理（0、5、10 和 15‰）和 3 个生物炭处理（不添加生物炭、添加生物炭和添加生物炭-堆肥，生物炭和堆肥均由芦苇制成），采用完全随机设计。生物炭的添加和生物炭-堆肥的添加都增加了芦苇的地下生物量，生物炭-堆肥的添加使芦苇的总生物量显著增加了 35.5%，净光合速率显著增加了 51.4%。生物炭的添加和生物炭-堆肥的添加分别使土壤有机碳含量显著增加了 62.9%和 31.7%，但降低了土壤铵态氮含量。在盐渍土壤中，与单独添加生物炭相比，生物炭-堆肥的混合物对芦苇的生长有更强的积极影响。因此，在沿海湿地，土壤盐度是一种常见的环境胁迫，添加生物炭和堆肥可能是提高芦苇生产力的一种合适方法。
