College of History, Geography and Tourism, Shangrao Normal University, Shangrao, 334000, China.
Shangrao Vocational and Technical College, Shangrao, 334109, China.
Sci Rep. 2020 Jun 25;10(1):10331. doi: 10.1038/s41598-020-67160-w.
Pot experiments were carried out to study the effects of rice straw (RS) and rice straw ash (RSA) on the growth of early rice and α-diversity of bacterial community in soils around rare earth mining areas of Xunwu and Xinfeng counties in South Jiangxi of China. The results showed that the exploitation of rare earth resources leads to soil pollution around rare earth mining areas and affects the growth of rice, and the content of rare earth elements (REEs) in rice was positively correlated with that in soils and negative correlated with dry weight of rice; The addition of RS to soils around REE mining area can inhibit growth of early rice, and the dry weight of rice grains, shoots, roots is lower when compared with the controls, while the content of REEs is higher. The α-diversity of soil bacterial decreases, which promotes the growth of Pseudorhodoferax, Phenylobacterium and other bacteria of the same kind, and inhibits the growth of beneficial bacteria. The addition of RSA to soils had no significant effect on α-diversity of soil bacterial but promoted the growth of Azospira and other beneficial bacteria, inhibited the growth of Bryobacter and other bacteria of the same kind, significantly improved the dry weight of grains, shoots and roots of early rice, and reduced the content of REEs in these parts of rice. It can be concluded that RS is unsuitable to be added to the planting soil of early rice in REE mining area, while RSA is suitable.
进行了盆栽实验，以研究稻草（RS）和稻草灰（RSA）对中国赣南寻乌县和信丰县稀土矿区周边土壤中早期水稻生长和细菌群落α多样性的影响。结果表明，稀土资源的开采导致了稀土矿区周边土壤的污染，影响了水稻的生长，水稻中稀土元素（REEs）的含量与土壤中REEs 的含量呈正相关，与水稻的干重呈负相关；在 REE 矿区周边土壤中添加 RS 会抑制早期水稻的生长，与对照相比，水稻籽粒、茎和根的干重较低，而 REEs 的含量较高。土壤细菌的α多样性降低，促进了假诺卡氏菌、苯基杆菌等同类细菌的生长，抑制了有益细菌的生长。向土壤中添加 RSA 对土壤细菌的α多样性没有显著影响，但促进了固氮螺菌等有益细菌的生长，抑制了 Bryobacter 等同类细菌的生长，显著提高了早期水稻的籽粒、茎和根的干重，并降低了这些部位水稻中 REEs 的含量。综上所述，RS 不适合添加到 REE 矿区的早稻种植土壤中，而 RSA 则适合。
