Soil nitrogen concentrations and transformations under different vegetation types in forested zones of the Loess Gully Region

Xiaoyi, 邢肖毅 Xing; Yimei, 黄懿梅 Huang; Shaoshan, 安韶山 An; Hong, 张宏 Zhang

doi:10.5846/stxb201207211037

Acta Eco Sin

2013

DOI: 10.5846/stxb201207211037

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Soil nitrogen concentrations and transformations under different vegetation types in forested zones of the Loess Gully Region

邢肖毅 Xing Xiaoyi¹,

黄懿梅 Huang Yimei²,

安韶山 An Shaoshan³

et al.

Abstract: The " Grain for Green冶 project is essential for controlling soil erosion in the Gully Region of the Loess Plateau, which has one of the most serious water and soil loss problems in the world. Different vegetation types change the soil environment to different extents, influencing the biogeochemical cycles of materials, such as nitrogen ( N) . At present, a growing number of researchers are investigating the relationship between vegetation and N forms in natural ecological systems to provide a theoretical basis… Show more

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Cited by 4 publications

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Plant‐facilitated effects of exotic earthwormPontoscolex corethruruson the soil carbon and nitrogen dynamics and soil microbial community in a subtropical field ecosystem

Zhang

Shao

et al. 2017

Ecology and Evolution

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Earthworms and plants greatly affect belowground properties; however, their combined effects are more attractive based on the ecosystem scale in the field condition. To address this point, we manipulated earthworms (exotic endogeic species Pontoscolex corethrurus) and plants (living plants [native tree species Evodia lepta] and artificial plants) to investigate their combined effects on soil microorganisms, soil nutrients, and soil respiration in a subtropical forest. The manipulation of artificial plants aimed to simulate the physical effects of plants (e.g., shading and interception of water) such that the biological effects of plants could be evaluated separately. We found that relative to the controls, living plants but not artificial plants significantly increased the ratio of fungal to bacterial phospholipid fatty acids (PLFAs) and fungal PLFAs. Furthermore, earthworms plus living plants significantly increased the soil respiration and decreased the soil NH 4 +‐N, which indicates that the earthworm effects on the associated carbon, and nitrogen processes were greatly affected by living plants. The permutational multivariate analysis of variance results also indicated that living plants but not earthworms or artificial plants significantly changed the soil microbial community. Our results suggest that the effects of plants on soil microbes and associated soil properties in this study were largely explained by their biological rather than their physical effects.

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Plant‐facilitated effects of exotic earthwormPontoscolex corethruruson the soil carbon and nitrogen dynamics and soil microbial community in a subtropical field ecosystem

Zhang

Shao

et al. 2017

Ecology and Evolution

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Sand-fixing characteristics of Carex brunnescens and its application with straw checkerboard technique in restoration of degraded alpine meadows

et al. 2017

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Carex brunnescens (Pers.), a typical clonal species, is considered to be the only herb found to date that can develop on sand dunes in Maqu alpine region of northwestern China. However, the characteristics that C. brunnescens resists to harsh alpine environment have not been documented. In this study, we conducted a field investigation to determine the morphological, reproductive, and sand-fixing characteristics of C. brunnescens. Concomitantly, we transplanted the belowground rhizomes of C. brunnescens to sand dunes and compared the abilities to restore degraded alpine meadows among sand dunes that had no further treatment (SD+N), sand dunes that had straw checkerboard technique but no transplanted rhizomes of C. brunnescens (SD+SCT), and sand dunes that had both SCT and transplanted rhizomes of C. brunnescens (SD+SCT+P). We found that belowground vertical rhizomes and horizontal rhizomes (including branching rhizomes and main rhizomes) of C. brunnescens were highly developed and that population reproduction was dominated by horizontal rhizomes. C. brunnescens exhibited a significant sand-fixation effect under following conditions: population density was 145-156 ramets/m 2 , vegetation cover was 31.2%-39.3%, total length of belowground rhizomes was 11,223 cm/m 2 , total length of belowground first-order roots was 9161-10,524 cm/m 2 , fresh weight of aboveground part was 198.5-212.6 g/m 2 , and fresh weight of belowground part was 578.8-612.4 g/m 2. It should be particularly noted that SD+SCT+P treatment (sand dunes that had both straw checkerboard technique and transplanted rhizomes of C. brunnescens) was the best and SD+N (sand dunes that had no further treatment) was the worst in terms of following biotic indicators: total number of reproductive ramets, total number of belowground rhizomes, and fresh weight of aboveground and belowground parts of C. brunnescens, contents of soil organic carbon, available nitrogen, microbial biomass carbon, and microbial biomass nitrogen. It implies that applying SCT in sand dunes and transplanting belowground rhizomes to sand dunes with SCT could improve both soil fertility and growth of C. brunnescens. These results suggest that the SCT-promoted high reproductive abilities of belowground rhizomes of C. brunnescens can successfully facilitate the establishment of ramets and can thus be an effective strategy to restore degraded vegetation in Maqu alpine region of northwestern China.

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Distribution of soil carbon and nitrogen in two typical forests in the semiarid region of the Loess Plateau, China

Song

Yan

Hou

et al. 2016

CATENA

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Soil nitrogen concentrations and transformations under different vegetation types in forested zones of the Loess Gully Region

Cited by 4 publications

References 1 publication

Plant‐facilitated effects of exotic earthwormPontoscolex corethruruson the soil carbon and nitrogen dynamics and soil microbial community in a subtropical field ecosystem

Plant‐facilitated effects of exotic earthwormPontoscolex corethruruson the soil carbon and nitrogen dynamics and soil microbial community in a subtropical field ecosystem

Sand-fixing characteristics of Carex brunnescens and its application with straw checkerboard technique in restoration of degraded alpine meadows

Distribution of soil carbon and nitrogen in two typical forests in the semiarid region of the Loess Plateau, China

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