鄱阳湖沙化土地植物-凋落物-土壤化学计量特征

生态学杂志

鄱阳湖沙化土地植物-凋落物-土壤化学计量特征

陆远鸿¹,曹昀^1,2*,许令明¹,张英¹,郑林^1,2,胡启武^1,2

（¹江西师范大学地理与环境学院，南昌 330022; ²鄱阳湖湿地与流域研究教育部重点实验室，南昌 330022）

出版日期:2019-02-10 发布日期:2019-02-10

Stoichiometric characteristics of plants, litter and soils in desertification area of Poyang Lake.

LU Yuan-hong¹, CAO Yun^1,2*, XU Ling-ming¹, ZHANG Ying¹, ZHENG Lin^1,2, HU Qi-wu^1,2

(¹School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China; ²Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, China).

Online:2019-02-10 Published:2019-02-10

摘要/Abstract

摘要：

探明鄱阳湖沙化区植被恢复后植物、凋落物与土壤碳(C)、氮(N)、磷(P)化学计量特征，对我国亚热带地区沙化土地的生态恢复与重建具有重要意义。在江西省都昌县典型沙化区建立110 hm²沙化土地恢复试验区，采集狗牙根(Cynodon dactylon)、香根草（Vetiveria zizanioides）、单叶蔓荆(Vitex rotundifolia)、算盘子(Glochidion puberum)、湿地松(Pinus elliottii)5种优势植物的新鲜叶片、凋落物及林下表层0～10 cm土壤样品，测定有机C、全N、全P含量。结果表明：（1）5种植物叶片C、N、P含量平均为394.3、11.9、1.2 mg·g^-1；凋落物C、N、P含量平均为366.7、6.8、0.9 mg·g^-1；表层土壤C、N、P含量平均为6.8、0.4、0.5 mg·g^-1；叶片养分含量显著高于凋落物和土壤。（2）叶片与土壤C、P含量和C∶P显著相关（P<0.05）；凋落物C、N、P含量与叶片C、N、P含量及化学计量比呈极显著相关（P<0.01），与土壤C、N、P含量及C∶P显著相关（P<0.05）。（3）鄱阳湖沙地植物C、N、P含量低于全国平均水平。轻度沙化区14<N∶P<16，中度、重度沙化区N∶P<14，根据营养限制定理，该地区植物生长受N、P共同作用的同时更多受N限制。

关键词: 狼毒, 种子萌发, 种群更新, 有毒植物

Abstract: Clarifying the C∶N∶P stoichiometry of plantlitter soil continuum after vegetation restoration in desertification area of Poyang Lake has great significance for ecological restoration and reconstruction of desertification land in subtropical regions of China. We established a restored ecosystem with an area of 110 hm² in a typical desertification area of Duchang, Jiangxi Province. We collected 0-10 cm soil samples, fresh leaves, and litters of five dominant species, including Cynodon dactylon, Vetiveria zizanioides, Vitex rotundifolia, Glochidion wilsonii, and Pinus elliottii. We measured C, N, and P concentrations in all samples. The results showed that: (1) The average concentrations of C, N, P in leaves of five species were 394.3, 11.9 and 1.2 mg·g^-1, 366.7, 6.8 and 0.9 mg·g^-1 in litters and 6.8, 0.4 and 0.5 mg·g^-1 in soils. The concentrations of elements in leaves were significantly higher than those in litters and soils. (2) Significant correlations of C and P concentrations and C∶P were found between leaf and soil (P<0.05). C, N, P concentrations in litters were significantly correlated with C, N, P concentrations and stoichiometric ratios in leaves (P<0.01), and significantly correlated with C, N, P concentrations and C∶P in soils (P<0.05). (3) C, N, P concentrations of plants in Poyang Lake desertification land were lower than national mean values of China. Leaf N∶P was 14-16 in mild desertification area, and <14 in moderate and heavy desertification area. According to nutrient limitation theory, plant growth in this area was colimited by N and P, and with relatively much stronger limitation of N.

Key words: Stellera chamaejasme, Seed germination, Population regeneration, Poisonous plant

陆远鸿,曹昀,许令明,张英,郑林,胡启武. 鄱阳湖沙化土地植物-凋落物-土壤化学计量特征[J]. 生态学杂志.

LU Yuan-hong, CAO Yun, XU Ling-ming, ZHANG Ying, ZHENG Lin, HU Qi-wu. Stoichiometric characteristics of plants, litter and soils in desertification area of Poyang Lake.[J]. cje.

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