Soil stabilization linked to plant diversity and environmental context in coastal wetlands.
Soil stabilization linked to plant diversity and environmental context in coastal wetlands.
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DOI：
10.1111/jvs.12367
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
Skov MW
中科院分区：
文献类型：
--
作者：
Ford H;Garbutt A;Ladd C;Malarkey J;Skov MW
植物在土壤稳定中发挥着关键作用，地上植被和根系结合在一起，从物理上保护土壤免受侵蚀。不同的植物群落可能提高了根的生物量，对土壤稳定性产生了连锁反应，但这些关系尚未理清。我们假设土壤侵蚀率随着植物物种丰富度的增加而下降，并明确测试了根生物量与植物多样性的关系有多密切。我们在盐沼草原上验证了这一假设，这是一种在防洪方面发挥关键作用的动态生态系统。采用逐步回归的方法，研究了两种不同土壤类型：耐侵蚀粘土(英国东南部埃塞克斯)和易侵蚀沙地(英国西北部莫克坎贝湾)盐沼土壤中生物变量(如植物多样性)和非生物变量对根系生物量和土壤稳定性的影响。总共提取了132个(30厘米深)天然沼泽岩心，并将其暴露在循环水槽中的水的侧向侵蚀中。土壤侵蚀速率随着植物物种丰富度的增加而下降(R2=0.55)，当丰富度被建模为单一解释变量时，但在易侵蚀(R2=100.44)地区比抗侵蚀(R2=100.18)地区更重要。随着植物物种丰富度从2种增加到9种·m−2，土壤侵蚀率的变异系数显著减小(R2=40.92)。植物物种丰富度是根生物量的显著预测因子(R2=0.22)。逐步回归表明，五个关键变量可以解释区域间土壤侵蚀率变化的80%。粘粒粉粒含量和土壤碳储量对侵蚀速率变化的贡献率较低，分别为24%和31%。在区域分析中，非生物因素的重要性下降，根生物量解释了25%的变化。植物多样性解释了易受侵蚀的沙区12%的变化。我们的研究表明，土壤稳定化和根系生物量与植物多样性呈正相关。多样性效应在土壤易受侵蚀(沙质、有机含量低)的生物地理环境中更为明显，这表明生物多样性对环境过程的普遍影响也适用于侵蚀保护的生态系统服务。
Plants play a pivotal role in soil stabilization, with above‐ground vegetation and roots combining to physically protect soil against erosion. It is possible that diverse plant communities boost root biomass, with knock‐on positive effects for soil stability, but these relationships are yet to be disentangled. We hypothesize that soil erosion rates fall with increased plant species richness, and test explicitly how closely root biomass is associated with plant diversity. We tested this hypothesis in salt marsh grasslands, dynamic ecosystems with a key role in flood protection. Using step‐wise regression, the influences of biotic (e.g. plant diversity) and abiotic variables on root biomass and soil stability were determined for salt marshes with two contrasting soil types: erosion‐resistant clay (Essex, southeast UK) and erosion‐prone sand (Morecambe Bay, northwest UK). A total of 132 (30‐cm depth) cores of natural marsh were extracted and exposed to lateral erosion by water in a re‐circulating flume. Soil erosion rates fell with increased plant species richness (R 2 = 0.55), when richness was modelled as a single explanatory variable, but was more important in erosion‐prone (R 2 = 0.44) than erosion‐resistant (R 2 = 0.18) regions. As plant species richness increased from two to nine species·m−2, the coefficient of variation in soil erosion rate decreased significantly (R 2 = 0.92). Plant species richness was a significant predictor of root biomass (R 2 = 0.22). Step‐wise regression showed that five key variables accounted for 80% of variation in soil erosion rate across regions. Clay‐silt fraction and soil carbon stock were linked to lower rates, contributing 24% and 31%, respectively, to variation in erosion rate. In regional analysis, abiotic factors declined in importance, with root biomass explaining 25% of variation. Plant diversity explained 12% of variation in the erosion‐prone sandy region. Our study indicates that soil stabilization and root biomass are positively associated with plant diversity. Diversity effects are more pronounced in biogeographical contexts where soils are erosion‐prone (sandy, low organic content), suggesting that the pervasive influence of biodiversity on environmental processes also applies to the ecosystem service of erosion protection.
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影响因子：
5.2
作者：
Bouma, TJ;Nielsen, KL;Koutstaal, B
通讯作者：
Koutstaal, B
影响因子：
3.3
作者：
De Baets, S.;Poesen, J.;Meersmans, J.
通讯作者：
Meersmans, J.
影响因子：
2.8
作者：
Langlois, E;Bonis, A;Bouzillé, JB
通讯作者：
Bouzillé, JB
DOI：
10.1111/j.1365-2389.1964.tb00247.x
发表时间：
1964-01-01
期刊：
JOURNAL OF SOIL SCIENCE
影响因子：
--
作者：
BALL, DF
通讯作者：
BALL, DF
影响因子：
64.8
作者：
Isbell, Forest;Calcagno, Vincent;Loreau, Michel
通讯作者：
Loreau, Michel