Lv Wanjie, Zhou Guomo, Chen Guangsheng, Zhou Yufeng, Ge Zhipeng, Niu Zhengwen, Xu Lin, Shi Yongjun
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, China.
Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-Efficiency Utilization, Zhejiang A&F University, Hangzhou, China.
Front Plant Sci. 2020 Dec 3;11:591852. doi: 10.3389/fpls.2020.591852. eCollection 2020.
Phytolith-occluded carbon (PhytOC), a promising long-term biogeochemical carbon sequestration mode, plays a crucial role in the global carbon cycle and the regulation of atmospheric CO. Previous studies mostly focused on the estimation of the content and storage of PhytOC, while it remains unclear about how the management practices affect the PhytOC content and whether it varies with stand age. Moso bamboo ( var. ) has a great potential in carbon sequestration and is rich in PhytOC. Here, we selected four management treatments, including control (CK), compound fertilization (CF), silicon (Si) fertilization (SiF) (monosilicic acid can form phytoliths through silicification), and cut to investigate the variation of phytoliths and PhytOC contents in soil, leaves, and litters, and their storage in Moso bamboo forests. In soil, the SiF fertilizer treatment significantly ( < 0.05) increased phytolith content, PhytOC content, and storage compared to CK, while there were no significant differences between the treatments of CF and cut. In leaf, compared with CK, phytolith content of the second-degree leaves under SiF and the first-degree leaves under cut treatment significantly increased, and the three treatments significantly increased PhytOC storage for leaves with three age classes. In litter, the phytolith and PhytOC contents under the three treatments were not significantly different from that under the CK treatment. The PhytOC storage increased by 19.33% under SiF treatment, but significantly decreased by 40.63% under the CF treatment. For the entire Moso bamboo forest ecosystems, PhytOC storage of all the three management treatments increased compared with CK, with the largest increase by 102% under the SiF treatment. The effects of management practices on the accumulation of PhytOC varied with age. Our study implied that Si fertilization has a greater potential to significantly promote the capacity of sequestration of carbon in Moso bamboo forests.
植硅体封存碳（PhytOC）是一种很有前景的长期生物地球化学碳固存模式，在全球碳循环和大气CO调节中起着关键作用。以往的研究大多集中在PhytOC含量和储量的估算上，而管理措施如何影响PhytOC含量以及它是否随林分年龄变化尚不清楚。毛竹（Phyllostachys edulis (Carrière) J. Houz.）具有很大的碳固存潜力，且富含PhytOC。在此，我们选择了四种管理处理方式，包括对照（CK）、复合肥施肥（CF）、硅（Si）肥施肥（SiF）（单硅酸可通过硅化作用形成植硅体）以及砍伐，以研究土壤、叶片和凋落物中植硅体和PhytOC含量的变化及其在毛竹林中的储量。在土壤中，与CK相比，SiF施肥处理显著（P < 0.05）提高了植硅体含量、PhytOC含量和储量，而CF和砍伐处理之间没有显著差异。在叶片方面，与CK相比，SiF处理下的二级叶片和砍伐处理下的一级叶片的植硅体含量显著增加，并且这三种处理显著增加了三个年龄级叶片的PhytOC储量。在凋落物中，这三种处理下的植硅体和PhytOC含量与CK处理下的无显著差异。SiF处理下PhytOC储量增加了19.33%，但CF处理下显著减少了40.63%。对于整个毛竹森林生态系统，与CK相比，所有三种管理处理的PhytOC储量都增加了，SiF处理下增加最多，达102%。管理措施对PhytOC积累的影响随年龄而异。我们的研究表明，施硅在显著促进毛竹林碳固存能力方面具有更大潜力。
