Distribution And Restoration Of Si And Pin Bamboos Of Three Types

Terrestrial ecosystem and the global biogechemical silica cycle is closely related to the global balance of soil carbon and global warming. Bamboo is one of the typical hyperaccumulator of Si. biogenic Si accumulation rate in its forest soil was much higher than that of tropic rain forest, grassland, temperate deciduous and coniferous forest soil.This study sampled organs(leaf, branch, culm, stump, root and rhizome) litter falls ofseveral representativebamboospecies belonging to three types at the experiment base of Jiyong Plantation in Zhejiang Agricultural and Forestry Universitytoinvestigate the biological silicon and phosphorus cycle in bamboo ecosystems.The main purpose of this study is to provide scientific references for understanding the role of phytoliths in biogeochemical carbon sequestration through the method of lithium metaborate digestion procedure,molybdenum blue spectrophotometry and method Bray.The results showed that the Si content of the organs in different bamboo species ranged significantly from 1.77g·kg-1 to 63.10 g·kg-1, and decreased as: leaf>branch>stump> root>rhizome>culm. The Sidistribution in bamboos of three types decreases as: mixed bamboo>scattered bamboo>clustered bamboo. The mean storage and fluxes of Si in three type bamboo showed the followingtrend: mixed bamboo(2225.91 kg·ha-1·a-1; 1112.96 kg·ha-1·a-1) >scattered bamboo(788.18 kg·ha-1·a-1; 394.06 kg·ha-1·a-1) >clustered bamboo(586.00 kg·ha-2·a-1; 293.00 kg·ha-1·a-1). Annual storage and fluxes of Si of scattered bamboo in China were much higher than that in clustered bamboo and mixed bamboo because of its wider distribution area. The mean flux of phytolith carbon sequestration in three type bamboos decreased as: mixed bamboo(38.83kg·ha-1·a-1)> scattered bamboo(33.69kg·ha-1·a-1)>clustered bamboo(27.32kg·ha- 1·a- 1).The rate of phytolith carbon sequestration in scattered bamboo in China(190.69-197.48×106kg·a-1) is 5.46 times the clustered bamboo and 35.7 times the mixed bamboo.Thus, both increasing the bamboo area and selecting bamboo(type., scattered bamboo) species with high-phytolith carbon contentwould increase the sequestration of atmospheric CO2 within bamboo phytoliths through the reasonable approach( returnfrom bamboo residues) in future bamboo forest.The results showed that the P content of the organs in different bamboo species decreased as: leaf>rhizome>branch>culm>stump> root. The Pdistribution in bamboos of three types decreases as:clustered bamboo>scattered bamboo>mixed bamboo. The mean P storage and fluxes of P in three type bamboo showed the followingtrend: mixed bamboo>clustered bamboo>scattered bamboo. Annual storage of P of scattered bamboo(458.16×106kg·a-1) in China were respectively 4.40 times the clustered bamboo and 29.09 times the mixed bamboo. The preliminary estimate, the fluxes of P in scattered bamboo 、 clustered bamboo and mixed bamboo in China were 16.19-71.94×106,8.85-11.58×106,1.80-2.74×106 kg·a-1,respectively. The Sicontent of leaves had highly significant negative correlation with the content of P, while they have a significant positive correlation in culms.The results showed that the Si content of the litter falls in different bamboo species of three types decreased as:clustered bamboo(75.88 g·kg-1)> mixed bamboo(54.37 g·kg-1)>scattered bamboo(51.59 g·kg-1).The biomasses of the litter falls in different bamboo species of three types had achieved the highest level from May to June, except some species had reached the summit in pre and post two months. Annual return amount of Si of scattered bamboo(1548.71×106kg·a-1) in China were respectively 3.74 times the clustered bamboo(413.70×106kg·a-1)and 28.11 times the mixed bamboo(55.09×106kg·a-1). The preliminary estimate, The mean flux of phytolith carbon sequestration in three type bamboos decreased as: mixed bamboo(53.52g·ha-1·a-1)> scattered bamboo(31.72 g·ha-1·a-1)>clustered bamboo(30.97 g·ha-1·a-1).The ratio of Si/P of the litter falls in different bamboo species of three types had reached the summit from April to July, bue were stable from Auguest to December, while its mean value decreased from 350.69~90.03. As mixed bamboo has a stronger ability to sequester the carbon, both increasing the bamboo area and selecting bamboo(type, mixed bamboo) species with high-phytolith carbon contentwould increase the sequestration of atmospheric CO2 within bamboo phytoliths through the reasonable approach( returnfrom bamboo residues) in future bamboo forest.