Wang Qiong, Wang Wenjie, He Xingyuan, Zhang Wentian, Song Kaishan, Han Shijie
Urban Forests and Wetlands Research Group, Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun, China.
Key Laboratory of Forest Plant Ecology, Northeast Forestry University, Harbin, China.
PLoS One. 2015 Oct 2;10(10):e0139623. doi: 10.1371/journal.pone.0139623. eCollection 2015.
The glycoprotein known as glomalin-related soil protein (GRSP) is abundantly produced on the hyphae and spores of arbuscular mycorrhizal fungi (AMF) in soil and roots. Few studies have focused on its amount, composition and associations with soil properties and possible land-use influences, although the data hints at soil rehabilitation. By choosing a primary forest soil as a non-degraded reference, it is possible to explore whether afforestation can improve degraded farmland soil by altering GRSP. In this paper, close correlations were found between various soil properties (soil organic carbon, nitrogen, pH, electrical conductivity (EC), and bulk density) and the GRSP amount, between various soil properties and GRSP composition (main functional groups, fluorescent substances, and elements). Afforestation on farmland decreased the EC and bulk density (p < 0.05). The primary forest had a 2.35-2.56-fold higher GRSP amount than those in the plantation forest and farmland, and GRSP composition (tryptophan-like and fulvic acid-like fluorescence; functional groups of C-H, C-O, and O-H; elements of Al, O, Si, C, Ca, and N) in primary forest differed from those in plantation forest and farmland (p < 0.05). However, no evident differences in GRSP amount and composition were observed between the farmland and the plantation forest. Our finding highlights that 30 years poplar afforestation on degraded farmland is not enough to change GRSP-related properties. A longer period of afforestation with close-to-nature managements may favor the AMF-related underground recovery processes.
一种名为球囊霉素相关土壤蛋白（GRSP）的糖蛋白大量产生于土壤和根系中丛枝菌根真菌（AMF）的菌丝和孢子上。尽管有数据暗示其对土壤修复有作用，但很少有研究关注其含量、组成以及与土壤性质的关联和可能的土地利用影响。通过选择原始森林土壤作为未退化的参照，可以探究造林是否能通过改变GRSP来改善退化农田土壤。本文发现，各种土壤性质（土壤有机碳、氮、pH值、电导率（EC）和容重）与GRSP含量之间，以及各种土壤性质与GRSP组成（主要官能团、荧光物质和元素）之间存在密切相关性。农田造林降低了EC和容重（p < 0.05）。原始森林的GRSP含量比人工林和农田高2.35 - 2.56倍，且原始森林中GRSP的组成（类色氨酸和类富里酸荧光；C - H、C - O和O - H官能团；Al、O、Si、C、Ca和N元素）与人工林和农田不同（p < 0.05）。然而，农田和人工林之间在GRSP含量和组成上未观察到明显差异。我们的研究结果表明，在退化农田上进行30年的杨树造林不足以改变与GRSP相关的性质。更长时间的近自然管理造林可能有利于与AMF相关的地下恢复过程。
