Original data for Figure 1b, Figure 2, Figure 3 and Table1

Original data for Figure 1b, Figure 2, Figure 3 and Table1

Eroded soils sustain a substantial part of organic matter in tidal rivers adjacent to estuaries, and photochemical transformations of soils in tidal rivers would influence estuarine elemental cycles. However, complex aquatic environment and diverse soil sources complicate the enrichment of dissolved organic matter (DOM) photoreleased from soils. Here, we conducted a seven-day irradiation experiment for seven kinds of soils from lower basin of Dagu River (DGR) in the laboratory to study the influence of salinity and soils properties on DOM chemistry by characterizing the content and optical properties of DOM. Results showed that all soils of light cultures released higher amount of DOM and humic-like components than dark cultures. PCA and Mantel analysis found that salinity and soil properties significantly influence the production of photoreleased DOM especially humic-like components. Salinity could inhibit the photodissolution of soils and soils with high organic carbon content and aged soils with low δ¹³C_SOM released more DOM and humic-like components. Although DGR is impacted by intruded seawater, high correlation coefficient between the content of photoreleased DOM and total DOM content in seawater cultures still pointed out the important contribution of soil photodissolution to DOM reservoir of tidal rivers. Considering high proportion of humic-like components in photoreleased DOM, photochemical transformations of soils in tidal rivers would promote carbon export flux of estuaries to open seas. This study emphasizes the importance of soil photodissolution of tidal rivers in carbon transfer from lands to oceans.

Eroded soils sustain a substantial part of organic matter in tidal rivers adjacent to estuaries, and photochemical transformations of soils in tidal rivers would influence estuarine elemental cycles. However, complex aquatic environment and diverse soil sources complicate the enrichment of dissolved organic matter (DOM) photoreleased from soils. Here, we conducted a seven-day irradiation experiment for seven kinds of soils from lower basin of Dagu River (DGR) in the laboratory to study the influence of salinity and soils properties on DOM chemistry by characterizing the content and optical properties of DOM. Results showed that all soils of light cultures released higher amount of DOM and humic-like components than dark cultures. PCA and Mantel analysis found that salinity and soil properties significantly influence the production of photoreleased DOM especially humic-like components. Salinity could inhibit the photodissolution of soils and soils with high organic carbon content and aged soils with low δ¹³C_SOM released more DOM and humic-like components. Although DGR is impacted by intruded seawater, high correlation coefficient between the content of photoreleased DOM and total DOM content in seawater cultures still pointed out the important contribution of soil photodissolution to DOM reservoir of tidal rivers. Considering high proportion of humic-like components in photoreleased DOM, photochemical transformations of soils in tidal rivers would promote carbon export flux of estuaries to open seas. This study emphasizes the importance of soil photodissolution of tidal rivers in carbon transfer from lands to oceans.

Introduction

Chinese Discourse Treebank 0.5 was developed at Brandeis University as part of the Chinese Treebank Project and consists of approximately 73,000 words of Chinese newswire text annotated for discourse relations. It follows the lexically grounded approach of the Penn Discourse Treebank (PDTB) (LDC2008T05) with adaptations based on the linguistic and statistical characteristics of Chinese text. Discourse relations are lexically anchored by discourse connectives (e.g., because, but, therefore), which are viewed as predicates that take abstract objects such as propositions, events and states as their arguments. Along with PDTB-style schemes for English, Turkish, Hindi and Czech, Chinese Discourse Treebank provides an additional perspective on how the PDTB approach can be extended for cross-lingual annotation of discourse relations.

Data

Data was selected from the newswire material in Chinese Treebank 8.0 (LDC2013T21), specifically, from Xinhua News Agency stories. There are approximately 5,500 annotation instances. Following the PDTB format, each annotation instance consists of 27 vertical bar delimited fields. The fields specify the attributes of the discourse relation as a whole, as well as the attributes of its two arguments. Not all fields are filled in this release. Filled fields are indicated by a pair of angle brackets; the remaining fields are place holders for future releases.

Samples

Please view this annotation sample and raw sample.

Updates

None at this time.

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