Mixture of N2-fixing tree species promotes organic phosphorus accumulation and transformation in topsoil aggregates in a degraded karst region of subtropical China
Mixture of N2-fixing tree species promotes organic phosphorus accumulation and transformation in topsoil aggregates in a degraded karst region of subtropical China
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固氮树种混合促进中国亚热带退化喀斯特地区表土团聚体有机磷的积累和转化
DOI：
10.1016/j.geoderma.2022.115752
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发表时间：
2022-05
期刊：
影响因子：
6.1
通讯作者：
Xueman Huang
中科院分区：
文献类型：
--
作者：
Meng Li;Yeming You;Xumai Tan;Yuanguang Wen;Shuzhong Yu;Na Xiao;Weijun Shen;Xueman Huang
许多研究表明，在种植园中引入固氮树种可以通过生物固氮和更快的氮素循环来增加土壤氮素的有效性。然而，单一固氮树种和两种固氮树种组合种植对退化岩溶土壤磷(P)积累和转化的影响及其调控机制尚不清楚，且具有立地依赖性。本研究旨在研究在退化喀斯特地区引入固氮树种(单一树种和两种树种组合)对表土团聚体中有机磷(Po)积累和转化的影响。在亚热带中国的广西马山，对8年生的降香黄檀(PD)、黄檀(PA)纯林、黄檀(MP)混交林和毗邻的天然杂草地(CK)进行了对比试验。结果表明，与CK相比，MP处理土壤有机碳、硝态氮、速效磷和C/N比均显著增加(P<；−-N)。土壤微生物生物量N(MBN)和微生物生物量P(MBP)水平除MP样品中的微团聚体(<；0.25 mm)外，其余均显著增加(P<；P<0.05)。与之相反，在全土和大多数团聚体土壤中，PD、PA和CK样地之间的MBN和MBP没有显著差异。土壤中微生物、细菌、真菌、丛枝菌根真菌和放线菌的磷脂脂肪酸(PLFA)含量也显著高于CK和PD(P&t；P<0.05)。不稳定的Po和高度抗性的Po，以及所有测试的N、P水解酶的活性，在所有森林类型的散装土壤和大多数团聚体中都有所改善，特别是在MP样本中。冗余分析(RDA)表明，Po组分主要由碱性磷酸酶(ALP)、MBN和AM驱动我们的研究结果表明，引入固氮树种(尤其是MP)可能是提高根部氮素有效性和AM定殖率的有效方法，从而促进中国西南喀斯特退化地区Po的积累和转化。
Many studies have shown that introducing N2-fixing tree species into plantations can increase soil nitrogen (N) availability, via biological N2fixation and faster N cycling. However, the effects and regulatory mechanisms of N2-fixing tree species in planting single species vs a combination of two species on phosphorus (P) accumulation and transformation in degraded karst soils remain poorly understood and appear site-dependent. This study aimed to determine the effects of introducing N2-fixing tree species (via single species vs a combination of two species) into a degraded karst region on organic phosphorus (Po) accumulation and transformation in topsoil aggregates. A comparative experiment was performed involving 8-year-old pure plantations ofDalbergia odorifera(PD) andAcrocarpus fraxinifolius(PA), a mixed plantation ofDalbergia odoriferaandAcrocarpus fraxinifolius(MP), and an adjacent natural weed field (no trees, CK) in Mashan, Guangxi, subtropical China. The results showed that the contents of soil organic carbon (SOC), nitrate nitrogen (NO3−-N), available phosphorus (AP) and C:N ratios in bulk soil and aggregates, increased significantly (P< 0.05) in MP compared to CK. The levels of soil microbial biomass N (MBN) and microbial biomass P (MBP) in bulk and aggregate soils increased significantly (P< 0.05), except for micro-aggregates (<0.25 mm) in MP samples. In contrast, no significant differences of MBN or MBP were found among PD, PA and CK plots in bulk and most aggregate soils. The phospholipid fatty acid (PLFA) contents of all microbes, bacteria, fungi, arbuscular mycorrhizal (AM) fungi and actinomycetes were also significantly higher (P< 0.05) in MP than those in CK and PD in bulk and most aggregate soils. Labile Po and highly resistant Po, and the activities of all tested N and P hydrolytic enzymes, improved in bulk soil and most aggregate size classes in all forest types, especially in MP samples. Finally, redundancy analysis (RDA) indicated that Po fractions were primarily driven by alkaline phosphatase (ALP), MBN and AM. Our findings suggest that introducing N2-fixing tree species (especially MP) may be an effective method for increasing N availability and AM colonization of roots, and thereby promoting Po accumulation and transformation in degraded karst regions of southwest China.
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影响因子：
9.7
作者：
Saiya-Cork, KR;Sinsabaugh, RL;Zak, DR
通讯作者：
Zak, DR
西南岩溶地区次生演替过程中氮磷限制的变化
影响因子：
4.9
作者：
Pan, Fujing;Li, Dejun;Chen, Hongsong;Wang, Kelin
通讯作者：
Wang, Kelin
耕作对亚热带喀斯特地区土壤氮素有效性、团聚体大小和微生物量的影响
影响因子：
6.5
作者：
Xiao Shuang-Shuang;Ye Ying-Ying;Xiao Dan;Chen Wu-Rong;Zhang Wei;Wang Ke-Lin
通讯作者：
Wang Ke-Lin
影响因子：
4
作者：
Benjamin L Turner;S. Joseph Wright
通讯作者：
Benjamin L Turner;S. Joseph Wright
影响因子：
4
作者：
Lu, J. K.;Xu, D. P.;He, X. H.
通讯作者：
He, X. H.