Abiotic and biotic factors modulate plant biomass and root/shoot (R/S) ratios in grassland on the Loess Plateau, China

Yang, Yang; Dou, Yanxing; An, Shaoshan; Zhu, Zhiguang

doi:10.1016/j.scitotenv.2018.04.260

Cited by 37 publications

(27 citation statements)

References 66 publications

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“…Further, the positive linear relationships between litter and AGB ( R 2 = 0.8485), BGB ( R 2 = 0.8361) indicated that AGB and BGB were mainly dependent on litters. In recent decades, the dominant view supported the hump-shaped or unimodal pattern between plant diversity and productivity around the world (Fang, Liu & Xu, 1996; Mittelbach, Steiner & Scheiner, 2001; Tilman, Reich & Knops, 2006; Yang et al., 2018). For example, Tilman et al build a specific model to predict the number of plant species that coexisted on a limited resource base, and showed that plant diversity first increased and then decreased when the supply of natural resources was limited (Liu et al, 2018; Tang et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…In order to make this study representative, each sampling site was spaced approximately 1 km apart with the same natural conditions. Data were collected by previous study in Yang et al. (2018).…”

Section: Methodsmentioning

confidence: 99%

“…(2018) reported that above-ground diversity was strong related to below-ground diversity in an alpine ecosystem. Yang et al. (2018) studied how biotic and abiotic factors modulate plant biomass in grasslands on the Loess Plateau.…”

Section: Introductionmentioning

confidence: 99%

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Testing relationship between plant productivity and diversity in a desertified steppe in Northwest China

Yang

Liu

2019

PeerJ

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The rapid global plant diversity and productivity loss has resulted in ecosystem functional degeneration in recent decades, and the relationship between plant diversity and productivity is a pressing issue around the world. Here, we sampled six plant communities that have not been grazed for 20 years, i.e., Agropyron mongolicum, Stipa bungeana, Cynanchum komarovii, Glycyrrhiza uralensis, Sophora alopecuroides, Artemisia ordosica, located in a desertified steppe, northwestern China, and tested the relationship between plant diversity and productivity in this region. We found a positive linear relationship between AGB (above-ground biomass) and BGB (below-ground biomass), and the curves between plant diversity and AGB were unimodal (R2 = 0.4572, p < 0.05), indicating that plant productivity increased at a low level of diversity but decreased at a high level of diversity. However, there was no significant relationship between BGB and plant diversity (p > 0.05). Further, RDA (redundancy analysis) indicated that soil factors had a strong effect on plant diversity and productivity. Totally, GAMs (generalized additive models) showed that soil factors (especially total nitrogen TN, total carbon TC, soil microbial biomass nitrogen SMB-N, soil microbial biomass carbon SMB-C) explained more variation in plant diversity and productivity (78.24%), which can be regarded as the key factors driving plant diversity and productivity. Therefore, strategies aiming to increase plant productivity and protect plant diversity may concentrate on promoting soil factors (e.g., increasing TC, TN, SMB-N and SMB-C) and plant species, which can be regarded as an effective and simple strategy to stabilize ecosystems to mitigate aridity in desertified steppes in northwestern China.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Testing relationship between plant productivity and diversity in a desertified steppe in Northwest China

Yang

Liu

2019

PeerJ

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“…Ketersediaan unsur hara yang cukup pada media tumbuh mendukung biomassa tanaman. Menurut Yang et al (2018), biomassa akar tanaman merupakan salah satu parameter kunci untuk melihat ketahanan, kemampuan bersaing dan kondisi fisik sebuah tanaman. Biomassa merupakan hasil akhir asimilasi karbon, fotosintesis, dan respirasi.…”

Section: Hasil Dan Pembahasanunclassified

Optimalisasi Ukuran Dan Jenis Polybag Terhadap Pertumbuhan Bibit Kelapa Sawit Di Pre Nursery

Rosnina¹,

Sapareng²,

Idawati³

2019

agrovital

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Pembibitan tanaman kelapa sawit dapat dilakukan melalui satu tahap pembibitan (single stage) atau dua tahap pembibitan (double stage). Kedua sistem pembibitan tersebut membutuhkan tanah lapisan atas (top soil) untuk mengisi polybag sebagai tempat menanam kecambah dan membesarkan bibit kelapa sawit sebagai bahan tanam di lapangan. Masalah utama yang akan timbul pada masa kini dan mendatang untuk mengembangkan lahan perkebunan kelapa sawit adalah pemindahan top soil dari satu tempat ke tempat lain. Top soil digunakan sebagai media tumbuh bibit kelapa sawit karena memiliki sifat fisik, kimia dan biologi tanah yang baik untuk pertumbuhan bibit selama di pembibitan. Hasil penelitian melaporkan bahwa kebutuhan media tumbuh pada tahap pembibitan awal (pre nursery) membutuhkan 0,001 m3top soil/polybag kecil (ukuran polybag kecil berdiameter 10 cm dengan tinggi 14 cm) dan 0.016 m3top soil/polybag besar (ukuran polybag besar berdiameter 23 cm dan tinggi 40 cm). Areal tanaman kelapa sawit seluas 1.000 ha dengan populasi 136 tanaman/ha ditambah sulaman 10% membutuhkan ± 150.000 bibit, dengan kebutuhan media tumbuh top soil yang sudah dipergunakan sebanyak 2.400 m3 atau setara dengan luas areal 16.000 m2 (1,6 ha), dengan kedalaman top soil 15 cm. Penelitian dilakukan dengan tujuan untuk mengetahui pengaruh ukuran dan jenis polibeg yang terbaik terhadap pertumbuhan bibit kelapa sawit di pre nursey serta tingkat efisiensi penggunaan polibeg. Penelitian akan dilaksanakan pada lahan milik petani di Desa Pattimang, Kecamatan Malangke Kabupaten Luwu Utara Provinsi Sulawesi Selatan. Percobaan dilakukan dalam bentuk eksperimen menggunakan Rancangan Acak Kelompok (RAK), dengan perlakuan satu faktor yaitu ukuran dan jenis baby polybag, yaitu polibeg hitam standar Pre Nursery (kontrol) (22 cm x 14 cm), polibeg kecil bening (18 cm x 9.5 cm), polibeg kecil hitam (15 cm x 5 cm), polibeg kecil bening (13 cm x 6 cm), dan plastik gelas. Percobaan diulang sebanyak 3 ulangan, sehingga terdapat 15 unit percobaan. Setiap unit percobaan terdiri dari 5 tanaman sehingga jumlah bibit yang digunakan yaitu 75 bibit kelapa sawit. Pengamatan yang dilakukan yaitu pertumbuhan (morfologi) yang meliputi tinggi tanaman, jumlah daun, diameter batang, dan fisiologi meliputibobot basah tajuk, bobot kering tajuk dan bobot basah akar, bobot kering akar, dan analisis tanah dilakukan pada awal dan akhir penelitian. Penggunaan berbagai jenis wadah meningkatkan pertumbuhan parameter morfologi tanaman (tinggi tanaman, diameter batang, jumlah daun) di pre nursery. Perlakuan terbaik berdasarkan peubah morfologi tanaman adalah polibeg hitam standar Pre Nursery, tetapi bisa digantik dengan plastik gelas bekas.

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“…While it is clear that environmental changes can significantly affect biomass allocation (Fan et al, 2009;Zhang et al, 2017;Yang et al, 2018;Zhou et al, 2020), most studies that explored the effects of climate change on biomass allocation have focused on aboveground biomass (Bai and Xu, 1997;Mokany et al, 2006;Bai et al, 2008;Gonzalez-Dugo et al, 2010). Few studies include belowground biomass as this is more difficult to measure, especially in the field (Milchunas et al, 2005;Ma et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Changes of Aboveground and Belowground Biomass Allocation in Four Dominant Grassland Species Across a Precipitation Gradient

Liu

et al. 2021

Front. Plant Sci.

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Climate change is predicted to affect plant growth, but also the allocation of biomass to aboveground and belowground plant parts. To date, studies have mostly focused on aboveground biomass, while belowground biomass and allocation patterns have received less attention. We investigated changes in biomass allocation along a controlled gradient of precipitation in an experiment with four plant species (Leymus chinensis, Stipa grandis, Artemisia frigida, and Potentilla acaulis) dominant in Inner Mongolia steppe. Results showed that aboveground biomass, belowground biomass and total biomass all increased with increasing growing season precipitation, as expected in this water-limited ecosystem. Biomass allocation patterns also changed along the precipitation gradient, but significant variation between species was apparent. Specifically, the belowground biomass: aboveground biomass ratio (i.e., B:A ratio) of S. grandis was not impacted by precipitation amount, while B:A ratios of the other three species changed in different ways along the gradient. Some of these differences in allocation strategies may be related to morphological differences, specifically, the presence of rhizomes or stolons, though no consistent patterns emerged. Isometric partitioning, i.e., constant allocation of biomass aboveground and belowground, seemed to occur for one species (S. grandis), but not for the three rhizome or stolon-forming ones. Indeed, for these species, the slope of the allometric regression between log-transformed belowground biomass and log-transformed aboveground biomass significantly differed from 1.0 and B:A ratios changed along the precipitation gradient. As changes in biomass allocation can affect ecosystem functioning and services, our results can be used as a basis for further studies into allocation patterns, especially in a context of environmental change.

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Abiotic and biotic factors modulate plant biomass and root/shoot (R/S) ratios in grassland on the Loess Plateau, China

Cited by 37 publications

References 66 publications

Testing relationship between plant productivity and diversity in a desertified steppe in Northwest China

Testing relationship between plant productivity and diversity in a desertified steppe in Northwest China

Optimalisasi Ukuran Dan Jenis Polybag Terhadap Pertumbuhan Bibit Kelapa Sawit Di Pre Nursery

Changes of Aboveground and Belowground Biomass Allocation in Four Dominant Grassland Species Across a Precipitation Gradient

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